server/mssteps.py
author Sylvain Thénault <sylvain.thenault@logilab.fr>
Mon, 15 Feb 2010 15:11:02 +0100
branchstable
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"""Defines the diferent querier steps usable in plans.
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FIXME : this code needs refactoring. Some problems :
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* get data from the parent plan, the latest step, temporary table...
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* each step has is own members (this is not necessarily bad, but a bit messy
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  for now)
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:organization: Logilab
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:copyright: 2003-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.
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:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr
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:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses
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"""
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__docformat__ = "restructuredtext en"
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from rql.nodes import VariableRef, Variable, Function
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from cubicweb.server.ssplanner import (LimitOffsetMixIn, Step, OneFetchStep,
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                                    varmap_test_repr, offset_result)
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AGGR_TRANSFORMS = {'COUNT':'SUM', 'MIN':'MIN', 'MAX':'MAX', 'SUM': 'SUM'}
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def remove_clauses(union, keepgroup):
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    clauses = []
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    for select in union.children:
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        if keepgroup:
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            having, orderby = select.having, select.orderby
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            select.having, select.orderby = None, None
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            clauses.append( (having, orderby) )
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        else:
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            groupby, having, orderby = select.groupby, select.having, select.orderby
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            select.groupby, select.having, select.orderby = None, None, None
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            clauses.append( (groupby, having, orderby) )
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    return clauses
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def restore_clauses(union, keepgroup, clauses):
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    for i, select in enumerate(union.children):
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        if keepgroup:
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            select.having, select.orderby = clauses[i]
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        else:
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            select.groupby, select.having, select.orderby = clauses[i]
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class FetchStep(OneFetchStep):
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    """step consisting in fetching data from sources, and storing result in
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    a temporary table
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    """
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    def __init__(self, plan, union, sources, table, keepgroup, inputmap=None):
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        OneFetchStep.__init__(self, plan, union, sources)
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        # temporary table to store step result
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        self.table = table
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        # should groupby clause be kept or not
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        self.keepgroup = keepgroup
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        # variables mapping to use as input
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        self.inputmap = inputmap
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        # output variable mapping
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        srqlst = union.children[0] # sample select node
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        # add additional information to the output mapping
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        self.outputmap = plan.init_temp_table(table, srqlst.selection,
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                                              srqlst.solutions[0])
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        for vref in srqlst.selection:
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            if not isinstance(vref, VariableRef):
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                continue
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            var = vref.variable
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            if var.stinfo['attrvars']:
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                for lhsvar, rtype in var.stinfo['attrvars']:
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                    if lhsvar.name in srqlst.defined_vars:
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                        key = '%s.%s' % (lhsvar.name, rtype)
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                        self.outputmap[key] = self.outputmap[var.name]
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            else:
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                rschema = self.plan.schema.rschema
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                for rel in var.stinfo['rhsrelations']:
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                    if rschema(rel.r_type).inlined:
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                        lhsvar = rel.children[0]
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                        if lhsvar.name in srqlst.defined_vars:
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                            key = '%s.%s' % (lhsvar.name, rel.r_type)
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                            self.outputmap[key] = self.outputmap[var.name]
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    def execute(self):
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        """execute this step"""
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        self.execute_children()
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        plan = self.plan
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        plan.create_temp_table(self.table)
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        union = self.union
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        # XXX 2.5 use "with"
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        clauses = remove_clauses(union, self.keepgroup)
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        for source in self.sources:
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            source.flying_insert(self.table, plan.session, union, plan.args,
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                                 self.inputmap)
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        restore_clauses(union, self.keepgroup, clauses)
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    def mytest_repr(self):
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        """return a representation of this step suitable for test"""
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        clauses = remove_clauses(self.union, self.keepgroup)
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        try:
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            inputmap = varmap_test_repr(self.inputmap, self.plan.tablesinorder)
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            outputmap = varmap_test_repr(self.outputmap, self.plan.tablesinorder)
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        except AttributeError:
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            inputmap = self.inputmap
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            outputmap = self.outputmap
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        try:
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            return (self.__class__.__name__,
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                sorted((r.as_string(kwargs=self.plan.args), r.solutions)
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                       for r in self.union.children),
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                sorted(self.sources), inputmap, outputmap)
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        finally:
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            restore_clauses(self.union, self.keepgroup, clauses)
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class AggrStep(LimitOffsetMixIn, Step):
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    """step consisting in making aggregat from temporary data in the system
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    source
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    """
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    def __init__(self, plan, selection, select, table, outputtable=None):
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        Step.__init__(self, plan)
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        # original selection
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        self.selection = selection
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        # original Select RQL tree
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        self.select = select
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        # table where are located temporary results
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        self.table = table
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        # optional table where to write results
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        self.outputtable = outputtable
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   123
        if outputtable is not None:
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            plan.init_temp_table(outputtable, selection, select.solutions[0])
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   125
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        #self.inputmap = inputmap
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257
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    def mytest_repr(self):
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        """return a representation of this step suitable for test"""
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        sel = self.select.selection
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        restr = self.select.where
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        self.select.selection = self.selection
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        self.select.where = None
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   134
        rql = self.select.as_string(kwargs=self.plan.args)
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        self.select.selection = sel
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   136
        self.select.where = restr
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        try:
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            # rely on a monkey patch (cf unittest_querier)
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            table = self.plan.tablesinorder[self.table]
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            outputtable = self.outputtable and self.plan.tablesinorder[self.outputtable]
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   141
        except AttributeError:
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            # not monkey patched
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            table = self.table
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            outputtable = self.outputtable
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        return (self.__class__.__name__, rql, self.limit, self.offset, table,
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                outputtable)
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   147
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    def execute(self):
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        """execute this step"""
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        self.execute_children()
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   151
        self.inputmap = inputmap = self.children[-1].outputmap
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        # get the select clause
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        clause = []
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        for i, term in enumerate(self.selection):
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            try:
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                var_name = inputmap[term.as_string()]
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            except KeyError:
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                var_name = 'C%s' % i
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   159
            if isinstance(term, Function):
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   160
                # we have to translate some aggregat function
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                # (for instance COUNT -> SUM)
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                orig_name = term.name
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   163
                try:
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   164
                    term.name = AGGR_TRANSFORMS[term.name]
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   165
                    # backup and reduce children
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                    orig_children = term.children
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   167
                    term.children = [VariableRef(Variable(var_name))]
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                    clause.append(term.accept(self))
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   169
                    # restaure the tree XXX necessary?
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                    term.name = orig_name
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                    term.children = orig_children
257
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   172
                except KeyError:
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   173
                    clause.append(var_name)
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   174
            else:
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                clause.append(var_name)
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   176
                for vref in term.iget_nodes(VariableRef):
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   177
                    inputmap[vref.name] = var_name
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   178
        # XXX handle distinct with non selected sort term
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   179
        if self.select.distinct:
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   180
            sql = ['SELECT DISTINCT %s' % ', '.join(clause)]
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   181
        else:
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   182
            sql = ['SELECT %s' % ', '.join(clause)]
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   183
        sql.append("FROM %s" % self.table)
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   184
        # get the group/having clauses
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   185
        if self.select.groupby:
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diff changeset
   186
            clause = [inputmap[var.name] for var in self.select.groupby]
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   187
            grouped = set(var.name for var in self.select.groupby)
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   188
            sql.append('GROUP BY %s' % ', '.join(clause))
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diff changeset
   189
        else:
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diff changeset
   190
            grouped = None
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   191
        if self.select.having:
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diff changeset
   192
            clause = [term.accept(self) for term in self.select.having]
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   193
            sql.append('HAVING %s' % ', '.join(clause))
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   194
        # get the orderby clause
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diff changeset
   195
        if self.select.orderby:
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diff changeset
   196
            clause = []
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diff changeset
   197
            for sortterm in self.select.orderby:
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diff changeset
   198
                sqlterm = sortterm.term.accept(self)
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diff changeset
   199
                if sortterm.asc:
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   200
                    clause.append(sqlterm)
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diff changeset
   201
                else:
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diff changeset
   202
                    clause.append('%s DESC' % sqlterm)
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parents:
diff changeset
   203
                if grouped is not None:
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diff changeset
   204
                    for vref in sortterm.iget_nodes(VariableRef):
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diff changeset
   205
                        if not vref.name in grouped:
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diff changeset
   206
                            sql[-1] += ', ' + self.inputmap[vref.name]
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diff changeset
   207
                            grouped.add(vref.name)
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diff changeset
   208
            sql.append('ORDER BY %s' % ', '.join(clause))
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parents:
diff changeset
   209
        if self.limit:
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diff changeset
   210
            sql.append('LIMIT %s' % self.limit)
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diff changeset
   211
        if self.offset:
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diff changeset
   212
            sql.append('OFFSET %s' % self.offset)
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diff changeset
   213
        #print 'DATA', plan.sqlexec('SELECT * FROM %s' % self.table, None)
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diff changeset
   214
        sql = ' '.join(sql)
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diff changeset
   215
        if self.outputtable:
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parents:
diff changeset
   216
            self.plan.create_temp_table(self.outputtable)
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diff changeset
   217
            sql = 'INSERT INTO %s %s' % (self.outputtable, sql)
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diff changeset
   218
        return self.plan.sqlexec(sql, self.plan.args)
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diff changeset
   219
257
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diff changeset
   220
    def visit_function(self, function):
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diff changeset
   221
        """generate SQL name for a function"""
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diff changeset
   222
        return '%s(%s)' % (function.name,
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parents:
diff changeset
   223
                           ','.join(c.accept(self) for c in function.children))
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diff changeset
   224
257
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diff changeset
   225
    def visit_variableref(self, variableref):
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diff changeset
   226
        """get the sql name for a variable reference"""
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diff changeset
   227
        try:
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diff changeset
   228
            return self.inputmap[variableref.name]
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parents:
diff changeset
   229
        except KeyError: # XXX duh? explain
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diff changeset
   230
            return variableref.variable.name
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diff changeset
   231
257
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diff changeset
   232
    def visit_constant(self, constant):
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diff changeset
   233
        """generate SQL name for a constant"""
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diff changeset
   234
        assert constant.type == 'Int'
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diff changeset
   235
        return str(constant.value)
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diff changeset
   236
257
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parents:
diff changeset
   237
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diff changeset
   238
class UnionStep(LimitOffsetMixIn, Step):
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parents:
diff changeset
   239
    """union results of child in-memory steps (e.g. OneFetchStep / AggrStep)"""
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diff changeset
   240
257
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diff changeset
   241
    def execute(self):
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diff changeset
   242
        """execute this step"""
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parents:
diff changeset
   243
        result = []
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diff changeset
   244
        limit = olimit = self.limit
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parents:
diff changeset
   245
        offset = self.offset
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parents:
diff changeset
   246
        assert offset != 0
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parents:
diff changeset
   247
        if offset is not None:
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parents:
diff changeset
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            limit = limit + offset
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        for step in self.children:
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            if limit is not None:
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                if offset is None:
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                    limit = olimit - len(result)
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                step.set_limit_offset(limit, None)
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            result_ = step.execute()
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            if offset is not None:
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                offset, result_ = offset_result(offset, result_)
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            result += result_
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            if limit is not None:
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                if len(result) >= olimit:
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                    return result[:olimit]
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        return result
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257
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    def mytest_repr(self):
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        """return a representation of this step suitable for test"""
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        return (self.__class__.__name__, self.limit, self.offset)
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341
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class IntersectStep(UnionStep):
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    """return intersection of results of child in-memory steps (e.g. OneFetchStep / AggrStep)"""
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341
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    def execute(self):
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        """execute this step"""
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        result = set()
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        for step in self.children:
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            result &= frozenset(step.execute())
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        result = list(result)
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        if self.offset:
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            result = result[self.offset:]
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        if self.limit:
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            result = result[:self.limit]
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        return result
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257
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class UnionFetchStep(Step):
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    """union results of child steps using temporary tables (e.g. FetchStep)"""
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    def execute(self):
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        """execute this step"""
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        self.execute_children()
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__all__ = ('FetchStep', 'AggrStep', 'UnionStep', 'UnionFetchStep', 'IntersectStep')