server/mssteps.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 08 Mar 2010 17:57:29 +0100
changeset 4831 c5aec27c1bf7
parent 4212 ab6573088b4a
child 5004 4cc020ee70e2
child 5421 8167de96c523
permissions -rw-r--r--
[repo] use logilab.db instead of lgc.adbh/lgc.db/lgc.sqlgen/indexer, test new date extranction functions
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     1
"""Defines the diferent querier steps usable in plans.
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     2
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     3
FIXME : this code needs refactoring. Some problems :
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     4
* get data from the parent plan, the latest step, temporary table...
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     5
* each step has is own members (this is not necessarily bad, but a bit messy
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     6
  for now)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     7
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
     8
:organization: Logilab
4212
ab6573088b4a update copyright: welcome 2010
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1977
diff changeset
     9
:copyright: 2003-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    10
:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
1977
606923dff11b big bunch of copyright / docstring update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 1802
diff changeset
    11
:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    12
"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    13
__docformat__ = "restructuredtext en"
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    14
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    15
from rql.nodes import VariableRef, Variable, Function
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    16
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    17
from cubicweb.server.ssplanner import (LimitOffsetMixIn, Step, OneFetchStep,
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    18
                                    varmap_test_repr, offset_result)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    19
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
    20
AGGR_TRANSFORMS = {'COUNT':'SUM', 'MIN':'MIN', 'MAX':'MAX', 'SUM': 'SUM'}
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    21
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    22
def remove_clauses(union, keepgroup):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    23
    clauses = []
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    24
    for select in union.children:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    25
        if keepgroup:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    26
            having, orderby = select.having, select.orderby
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    27
            select.having, select.orderby = None, None
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    28
            clauses.append( (having, orderby) )
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    29
        else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    30
            groupby, having, orderby = select.groupby, select.having, select.orderby
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    31
            select.groupby, select.having, select.orderby = None, None, None
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    32
            clauses.append( (groupby, having, orderby) )
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    33
    return clauses
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    34
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    35
def restore_clauses(union, keepgroup, clauses):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    36
    for i, select in enumerate(union.children):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    37
        if keepgroup:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    38
            select.having, select.orderby = clauses[i]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    39
        else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    40
            select.groupby, select.having, select.orderby = clauses[i]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    41
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    42
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    43
class FetchStep(OneFetchStep):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    44
    """step consisting in fetching data from sources, and storing result in
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    45
    a temporary table
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    46
    """
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    47
    def __init__(self, plan, union, sources, table, keepgroup, inputmap=None):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    48
        OneFetchStep.__init__(self, plan, union, sources)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    49
        # temporary table to store step result
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    50
        self.table = table
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    51
        # should groupby clause be kept or not
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    52
        self.keepgroup = keepgroup
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    53
        # variables mapping to use as input
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    54
        self.inputmap = inputmap
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    55
        # output variable mapping
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    56
        srqlst = union.children[0] # sample select node
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    57
        # add additional information to the output mapping
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    58
        self.outputmap = plan.init_temp_table(table, srqlst.selection,
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    59
                                              srqlst.solutions[0])
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    60
        for vref in srqlst.selection:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    61
            if not isinstance(vref, VariableRef):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    62
                continue
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    63
            var = vref.variable
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    64
            if var.stinfo['attrvars']:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    65
                for lhsvar, rtype in var.stinfo['attrvars']:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    66
                    if lhsvar.name in srqlst.defined_vars:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    67
                        key = '%s.%s' % (lhsvar.name, rtype)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    68
                        self.outputmap[key] = self.outputmap[var.name]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    69
            else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    70
                rschema = self.plan.schema.rschema
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    71
                for rel in var.stinfo['rhsrelations']:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    72
                    if rschema(rel.r_type).inlined:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    73
                        lhsvar = rel.children[0]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    74
                        if lhsvar.name in srqlst.defined_vars:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    75
                            key = '%s.%s' % (lhsvar.name, rel.r_type)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    76
                            self.outputmap[key] = self.outputmap[var.name]
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
    77
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    78
    def execute(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    79
        """execute this step"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    80
        self.execute_children()
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    81
        plan = self.plan
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    82
        plan.create_temp_table(self.table)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    83
        union = self.union
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    84
        # XXX 2.5 use "with"
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    85
        clauses = remove_clauses(union, self.keepgroup)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    86
        for source in self.sources:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    87
            source.flying_insert(self.table, plan.session, union, plan.args,
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    88
                                 self.inputmap)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    89
        restore_clauses(union, self.keepgroup, clauses)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
    90
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    91
    def mytest_repr(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    92
        """return a representation of this step suitable for test"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    93
        clauses = remove_clauses(self.union, self.keepgroup)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    94
        try:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    95
            inputmap = varmap_test_repr(self.inputmap, self.plan.tablesinorder)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    96
            outputmap = varmap_test_repr(self.outputmap, self.plan.tablesinorder)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    97
        except AttributeError:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    98
            inputmap = self.inputmap
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
    99
            outputmap = self.outputmap
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   100
        try:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   101
            return (self.__class__.__name__,
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   102
                sorted((r.as_string(kwargs=self.plan.args), r.solutions)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   103
                       for r in self.union.children),
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   104
                sorted(self.sources), inputmap, outputmap)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   105
        finally:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   106
            restore_clauses(self.union, self.keepgroup, clauses)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   107
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   108
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   109
class AggrStep(LimitOffsetMixIn, Step):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   110
    """step consisting in making aggregat from temporary data in the system
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   111
    source
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   112
    """
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   113
    def __init__(self, plan, selection, select, table, outputtable=None):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   114
        Step.__init__(self, plan)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   115
        # original selection
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   116
        self.selection = selection
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   117
        # original Select RQL tree
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   118
        self.select = select
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   119
        # table where are located temporary results
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   120
        self.table = table
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   121
        # optional table where to write results
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   122
        self.outputtable = outputtable
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   123
        if outputtable is not None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   124
            plan.init_temp_table(outputtable, selection, select.solutions[0])
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   125
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   126
        #self.inputmap = inputmap
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   127
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   128
    def mytest_repr(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   129
        """return a representation of this step suitable for test"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   130
        sel = self.select.selection
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   131
        restr = self.select.where
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   132
        self.select.selection = self.selection
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   133
        self.select.where = None
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   134
        rql = self.select.as_string(kwargs=self.plan.args)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   135
        self.select.selection = sel
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   136
        self.select.where = restr
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   137
        try:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   138
            # rely on a monkey patch (cf unittest_querier)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   139
            table = self.plan.tablesinorder[self.table]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   140
            outputtable = self.outputtable and self.plan.tablesinorder[self.outputtable]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   141
        except AttributeError:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   142
            # not monkey patched
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   143
            table = self.table
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   144
            outputtable = self.outputtable
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   145
        return (self.__class__.__name__, rql, self.limit, self.offset, table,
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   146
                outputtable)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   147
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   148
    def execute(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   149
        """execute this step"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   150
        self.execute_children()
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   151
        self.inputmap = inputmap = self.children[-1].outputmap
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   152
        # get the select clause
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   153
        clause = []
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   154
        for i, term in enumerate(self.selection):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   155
            try:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   156
                var_name = inputmap[term.as_string()]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   157
            except KeyError:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   158
                var_name = 'C%s' % i
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   159
            if isinstance(term, Function):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   160
                # we have to translate some aggregat function
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   161
                # (for instance COUNT -> SUM)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   162
                orig_name = term.name
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   163
                try:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   164
                    term.name = AGGR_TRANSFORMS[term.name]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   165
                    # backup and reduce children
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   166
                    orig_children = term.children
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   167
                    term.children = [VariableRef(Variable(var_name))]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   168
                    clause.append(term.accept(self))
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   169
                    # restaure the tree XXX necessary?
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   170
                    term.name = orig_name
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   171
                    term.children = orig_children
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   172
                except KeyError:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   173
                    clause.append(var_name)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   174
            else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   175
                clause.append(var_name)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   176
                for vref in term.iget_nodes(VariableRef):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   177
                    inputmap[vref.name] = var_name
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   178
        # XXX handle distinct with non selected sort term
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   179
        if self.select.distinct:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   180
            sql = ['SELECT DISTINCT %s' % ', '.join(clause)]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   181
        else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   182
            sql = ['SELECT %s' % ', '.join(clause)]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   183
        sql.append("FROM %s" % self.table)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   184
        # get the group/having clauses
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   185
        if self.select.groupby:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   186
            clause = [inputmap[var.name] for var in self.select.groupby]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   187
            grouped = set(var.name for var in self.select.groupby)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   188
            sql.append('GROUP BY %s' % ', '.join(clause))
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   189
        else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   190
            grouped = None
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   191
        if self.select.having:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   192
            clause = [term.accept(self) for term in self.select.having]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   193
            sql.append('HAVING %s' % ', '.join(clause))
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   194
        # get the orderby clause
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   195
        if self.select.orderby:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   196
            clause = []
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   197
            for sortterm in self.select.orderby:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   198
                sqlterm = sortterm.term.accept(self)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   199
                if sortterm.asc:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   200
                    clause.append(sqlterm)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   201
                else:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   202
                    clause.append('%s DESC' % sqlterm)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   203
                if grouped is not None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   204
                    for vref in sortterm.iget_nodes(VariableRef):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   205
                        if not vref.name in grouped:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   206
                            sql[-1] += ', ' + self.inputmap[vref.name]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   207
                            grouped.add(vref.name)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   208
            sql.append('ORDER BY %s' % ', '.join(clause))
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   209
        if self.limit:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   210
            sql.append('LIMIT %s' % self.limit)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   211
        if self.offset:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   212
            sql.append('OFFSET %s' % self.offset)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   213
        #print 'DATA', plan.sqlexec('SELECT * FROM %s' % self.table, None)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   214
        sql = ' '.join(sql)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   215
        if self.outputtable:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   216
            self.plan.create_temp_table(self.outputtable)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   217
            sql = 'INSERT INTO %s %s' % (self.outputtable, sql)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   218
        return self.plan.sqlexec(sql, self.plan.args)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   219
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   220
    def visit_function(self, function):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   221
        """generate SQL name for a function"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   222
        return '%s(%s)' % (function.name,
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   223
                           ','.join(c.accept(self) for c in function.children))
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   224
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   225
    def visit_variableref(self, variableref):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   226
        """get the sql name for a variable reference"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   227
        try:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   228
            return self.inputmap[variableref.name]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   229
        except KeyError: # XXX duh? explain
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   230
            return variableref.variable.name
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   231
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   232
    def visit_constant(self, constant):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   233
        """generate SQL name for a constant"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   234
        assert constant.type == 'Int'
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   235
        return str(constant.value)
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   236
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   237
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   238
class UnionStep(LimitOffsetMixIn, Step):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   239
    """union results of child in-memory steps (e.g. OneFetchStep / AggrStep)"""
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   240
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   241
    def execute(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   242
        """execute this step"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   243
        result = []
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   244
        limit = olimit = self.limit
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   245
        offset = self.offset
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   246
        assert offset != 0
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   247
        if offset is not None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   248
            limit = limit + offset
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   249
        for step in self.children:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   250
            if limit is not None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   251
                if offset is None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   252
                    limit = olimit - len(result)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   253
                step.set_limit_offset(limit, None)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   254
            result_ = step.execute()
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   255
            if offset is not None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   256
                offset, result_ = offset_result(offset, result_)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   257
            result += result_
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   258
            if limit is not None:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   259
                if len(result) >= olimit:
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   260
                    return result[:olimit]
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   261
        return result
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   262
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   263
    def mytest_repr(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   264
        """return a representation of this step suitable for test"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   265
        return (self.__class__.__name__, self.limit, self.offset)
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   266
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   267
341
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   268
class IntersectStep(UnionStep):
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   269
    """return intersection of results of child in-memory steps (e.g. OneFetchStep / AggrStep)"""
1802
d628defebc17 delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents: 470
diff changeset
   270
341
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   271
    def execute(self):
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   272
        """execute this step"""
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   273
        result = set()
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   274
        for step in self.children:
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   275
            result &= frozenset(step.execute())
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   276
        result = list(result)
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   277
        if self.offset:
448
ce91d0f23ed2 pylint fixes
sylvain.thenault@logilab.fr
parents: 341
diff changeset
   278
            result = result[self.offset:]
341
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   279
        if self.limit:
470
sylvain.thenault@logilab.fr
parents: 449
diff changeset
   280
            result = result[:self.limit]
341
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   281
        return result
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   282
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   283
257
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   284
class UnionFetchStep(Step):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   285
    """union results of child steps using temporary tables (e.g. FetchStep)"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   286
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   287
    def execute(self):
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   288
        """execute this step"""
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   289
        self.execute_children()
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   290
4c7d3af7e94d restore multi-sources capabilities
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents:
diff changeset
   291
341
0a426be2f3a2 fixes for some cases of neged inlined relations, may have to use (new) IntersectStep. XXX: write IntersectFetchStep
Sylvain Thenault <sylvain.thenault@logilab.fr>
parents: 257
diff changeset
   292
__all__ = ('FetchStep', 'AggrStep', 'UnionStep', 'UnionFetchStep', 'IntersectStep')