author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Wed, 15 Sep 2010 18:43:14 +0200 | |
branch | stable |
changeset 6251 | afc757568492 |
parent 5582 | 3e133b29a1a4 |
child 6297 | 23c1e50ff97b |
permissions | -rw-r--r-- |
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# copyright 2003-2010 LOGILAB S.A. (Paris, FRANCE), all rights reserved. |
8167de96c523
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parents:
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# contact http://www.logilab.fr/ -- mailto:contact@logilab.fr |
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3 |
# |
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parents:
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4 |
# This file is part of CubicWeb. |
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parents:
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5 |
# |
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proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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6 |
# CubicWeb is free software: you can redistribute it and/or modify it under the |
8167de96c523
proper licensing information (LGPL-2.1). Hope I get it right this time.
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parents:
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7 |
# terms of the GNU Lesser General Public License as published by the Free |
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proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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8 |
# Software Foundation, either version 2.1 of the License, or (at your option) |
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9 |
# any later version. |
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10 |
# |
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# CubicWeb is distributed in the hope that it will be useful, but WITHOUT |
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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12 |
# ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS |
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Sylvain Thénault <sylvain.thenault@logilab.fr>
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13 |
# FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more |
8167de96c523
proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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14 |
# details. |
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proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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15 |
# |
8167de96c523
proper licensing information (LGPL-2.1). Hope I get it right this time.
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
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16 |
# You should have received a copy of the GNU Lesser General Public License along |
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# with CubicWeb. If not, see <http://www.gnu.org/licenses/>. |
0 | 18 |
"""Functions to add additional annotations on a rql syntax tree to ease later |
19 |
code generation. |
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20 |
||
21 |
""" |
|
22 |
__docformat__ = "restructuredtext en" |
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23 |
||
24 |
from logilab.common.compat import any |
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||
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from rql import BadRQLQuery |
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from rql.nodes import Relation, VariableRef, Constant, Variable, Or, Exists |
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from rql.utils import common_parent |
29 |
||
30 |
def _annotate_select(annotator, rqlst): |
|
31 |
for subquery in rqlst.with_: |
|
32 |
annotator._annotate_union(subquery.query) |
|
33 |
#if server.DEBUG: |
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34 |
# print '-------- sql annotate', repr(rqlst) |
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35 |
getrschema = annotator.schema.rschema |
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438 | 36 |
has_text_query = False |
0 | 37 |
need_distinct = rqlst.distinct |
38 |
for rel in rqlst.iget_nodes(Relation): |
|
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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if getrschema(rel.r_type).symmetric and not isinstance(rel.parent, Exists): |
0 | 40 |
for vref in rel.iget_nodes(VariableRef): |
41 |
stinfo = vref.variable.stinfo |
|
42 |
if not stinfo['constnode'] and stinfo['selected']: |
|
43 |
need_distinct = True |
|
44 |
# XXX could mark as not invariant |
|
45 |
break |
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46 |
for var in rqlst.defined_vars.itervalues(): |
0 | 47 |
stinfo = var.stinfo |
48 |
if stinfo.get('ftirels'): |
|
49 |
has_text_query = True |
|
50 |
if stinfo['attrvar']: |
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51 |
stinfo['invariant'] = False |
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52 |
stinfo['principal'] = _select_main_var(stinfo['rhsrelations']) |
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53 |
continue |
|
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if not stinfo['relations'] and stinfo['typerel'] is None: |
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# Any X, Any MAX(X)... |
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# those particular queries should be executed using the system |
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57 |
# entities table unless there is some type restriction |
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58 |
stinfo['invariant'] = True |
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59 |
stinfo['principal'] = None |
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60 |
continue |
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61 |
if any(rel for rel in stinfo['relations'] if rel.r_type == 'eid' and rel.operator() != '=') and \ |
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not any(r for r in var.stinfo['relations'] - var.stinfo['rhsrelations'] |
|
63 |
if r.r_type != 'eid' and (getrschema(r.r_type).inlined or getrschema(r.r_type).final)): |
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# Any X WHERE X eid > 2 |
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# those particular queries should be executed using the system entities table |
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stinfo['invariant'] = True |
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stinfo['principal'] = None |
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continue |
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69 |
if stinfo['selected'] and var.valuable_references() == 1+bool(stinfo['constnode']): |
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# "Any X", "Any X, Y WHERE X attr Y" |
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stinfo['invariant'] = False |
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continue |
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joins = set() |
0 | 74 |
invariant = False |
75 |
for ref in var.references(): |
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76 |
rel = ref.relation() |
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77 |
if rel is None or rel.is_types_restriction(): |
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78 |
continue |
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79 |
lhs, rhs = rel.get_parts() |
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onlhs = ref is lhs |
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81 |
if rel.r_type == 'eid': |
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if not (onlhs and len(stinfo['relations']) > 1): |
0 | 83 |
break |
84 |
if not stinfo['constnode']: |
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85 |
joins.add(rel) |
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86 |
continue |
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87 |
elif rel.r_type == 'identity': |
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# identity can't be used as principal, so check other relation are used |
|
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# XXX explain rhs.operator == '=' |
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if rhs.operator != '=' or len(stinfo['relations']) <= 1: #(stinfo['constnode'] and rhs.operator == '='): |
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break |
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92 |
joins.add(rel) |
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continue |
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rschema = getrschema(rel.r_type) |
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if rel.optional: |
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if rel in stinfo.get('optrelations', ()): |
0 | 97 |
# optional variable can't be invariant if this is the lhs |
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# variable of an inlined relation |
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if not rel in stinfo['rhsrelations'] and rschema.inlined: |
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break |
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else: |
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# variable used as main variable of an optional relation |
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# can't be invariant |
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break |
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if rschema.final or (onlhs and rschema.inlined): |
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if rschema.type != 'has_text': |
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# need join anyway if the variable appears in a final or |
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# inlined relation |
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break |
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joins.add(rel) |
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continue |
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112 |
if not stinfo['constnode']: |
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if rschema.inlined and rel.neged(strict=True): |
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# if relation is inlined, can't be invariant if that |
0 | 115 |
# variable is used anywhere else. |
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# see 'Any P WHERE NOT N ecrit_par P, N eid 512': |
0 | 117 |
# sql for 'NOT N ecrit_par P' is 'N.ecrit_par is NULL' so P |
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# can use N.ecrit_par as principal |
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if (stinfo['selected'] or len(stinfo['relations']) > 1): |
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break |
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elif rschema.symmetric and stinfo['selected']: |
0 | 122 |
break |
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joins.add(rel) |
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else: |
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# if there is at least one ambigous relation and no other to |
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# restrict types, can't be invariant since we need to filter out |
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# other types |
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if not annotator.is_ambiguous(var): |
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invariant = True |
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stinfo['invariant'] = invariant |
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if invariant and joins: |
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# remember rqlst/solutions analyze information |
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# we have to select a kindof "main" relation which will "extrajoins" |
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# the other |
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# priority should be given to relation which are not in inner queries |
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# (eg exists) |
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try: |
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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stinfo['principal'] = _select_principal(var.scope, joins) |
0 | 139 |
except CantSelectPrincipal: |
140 |
stinfo['invariant'] = False |
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rqlst.need_distinct = need_distinct |
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return has_text_query |
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class CantSelectPrincipal(Exception): |
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"""raised when no 'principal' variable can be found""" |
0 | 148 |
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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def _select_principal(scope, relations, _sort=lambda x:x): |
0 | 150 |
"""given a list of rqlst relations, select one which will be used to |
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represent an invariant variable (e.g. using on extremity of the relation |
|
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instead of the variable's type table |
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""" |
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# _sort argument is there for test |
0 | 155 |
diffscope_rels = {} |
156 |
ored_rels = set() |
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diffscope_rels = set() |
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for rel in _sort(relations): |
0 | 159 |
# note: only eid and has_text among all final relations may be there |
160 |
if rel.r_type in ('eid', 'identity'): |
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161 |
continue |
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162 |
if rel.ored(traverse_scope=True): |
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ored_rels.add(rel) |
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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elif rel.scope is scope: |
0 | 165 |
return rel |
166 |
elif not rel.neged(traverse_scope=True): |
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167 |
diffscope_rels.add(rel) |
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168 |
if len(ored_rels) > 1: |
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ored_rels_copy = tuple(ored_rels) |
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170 |
for rel1 in ored_rels_copy: |
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171 |
for rel2 in ored_rels_copy: |
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172 |
if rel1 is rel2: |
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173 |
continue |
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174 |
if isinstance(common_parent(rel1, rel2), Or): |
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175 |
ored_rels.discard(rel1) |
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176 |
ored_rels.discard(rel2) |
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for rel in _sort(ored_rels): |
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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parents:
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if rel.scope is scope: |
0 | 179 |
return rel |
180 |
diffscope_rels.add(rel) |
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# if DISTINCT query, can use variable from a different scope as principal |
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182 |
# since introduced duplicates will be removed |
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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parents:
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if scope.stmt.distinct and diffscope_rels: |
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184 |
return iter(_sort(diffscope_rels)).next() |
0 | 185 |
# XXX could use a relation for a different scope if it can't generate |
186 |
# duplicates, so we would have to check cardinality |
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187 |
raise CantSelectPrincipal() |
0 | 188 |
|
189 |
def _select_main_var(relations): |
|
190 |
"""given a list of rqlst relations, select one which will be used as main |
|
191 |
relation for the rhs variable |
|
192 |
""" |
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193 |
principal = None |
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194 |
# sort for test predictability |
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parents:
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195 |
for rel in sorted(relations, key=lambda x: (x.children[0].name, x.r_type)): |
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196 |
# only equality relation with a variable as rhs may be principal |
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197 |
if rel.operator() not in ('=', 'IS') \ |
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198 |
or not isinstance(rel.children[1].children[0], VariableRef): |
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parents:
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199 |
continue |
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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200 |
if rel.scope is rel.stmt: |
0 | 201 |
return rel |
202 |
principal = rel |
|
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test and fix http://www.logilab.org/ticket/499838
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parents:
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203 |
if principal is None: |
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parents:
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204 |
raise BadRQLQuery('unable to find principal in %s' % ', '.join( |
50b87f759b5d
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205 |
r.as_string() for r in relations)) |
0 | 206 |
return principal |
207 |
||
208 |
||
438 | 209 |
def set_qdata(getrschema, union, noinvariant): |
0 | 210 |
"""recursive function to set querier data on variables in the syntax tree |
211 |
""" |
|
212 |
for select in union.children: |
|
213 |
for subquery in select.with_: |
|
438 | 214 |
set_qdata(getrschema, subquery.query, noinvariant) |
0 | 215 |
for var in select.defined_vars.itervalues(): |
216 |
if var.stinfo['invariant']: |
|
217 |
if var in noinvariant and not var.stinfo['principal'].r_type == 'has_text': |
|
218 |
var._q_invariant = False |
|
219 |
else: |
|
220 |
var._q_invariant = True |
|
221 |
else: |
|
222 |
var._q_invariant = False |
|
223 |
||
224 |
||
225 |
class SQLGenAnnotator(object): |
|
226 |
def __init__(self, schema): |
|
227 |
self.schema = schema |
|
228 |
self.nfdomain = frozenset(eschema.type for eschema in schema.entities() |
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follow yams 0.25 api changes to improve performance
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229 |
if not eschema.final) |
0 | 230 |
|
231 |
def annotate(self, rqlst): |
|
232 |
"""add information to the rql syntax tree to help sources to do their |
|
233 |
job (read sql generation) |
|
234 |
||
235 |
a variable is tagged as invariant if: |
|
236 |
* it's a non final variable |
|
237 |
* it's not used as lhs in any final or inlined relation |
|
238 |
* there is no type restriction on this variable (either explicit in the |
|
239 |
syntax tree or because a solution for this variable has been removed |
|
240 |
due to security filtering) |
|
241 |
""" |
|
3694 | 242 |
#assert rqlst.TYPE == 'select', rqlst |
0 | 243 |
rqlst.has_text_query = self._annotate_union(rqlst) |
244 |
||
245 |
def _annotate_union(self, union): |
|
246 |
has_text_query = False |
|
247 |
for select in union.children: |
|
248 |
htq = _annotate_select(self, select) |
|
249 |
if htq: |
|
250 |
has_text_query = True |
|
251 |
return has_text_query |
|
252 |
||
253 |
def is_ambiguous(self, var): |
|
254 |
# ignore has_text relation |
|
255 |
if len([rel for rel in var.stinfo['relations'] |
|
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[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
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diff
changeset
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256 |
if rel.scope is var.scope and rel.r_type == 'has_text']) == 1: |
0 | 257 |
return False |
258 |
try: |
|
259 |
data = var.stmt._deamb_data |
|
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changeset
|
260 |
except AttributeError: |
0 | 261 |
data = var.stmt._deamb_data = IsAmbData(self.schema, self.nfdomain) |
262 |
data.compute(var.stmt) |
|
263 |
return data.is_ambiguous(var) |
|
264 |
||
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diff
changeset
|
265 |
|
0 | 266 |
class IsAmbData(object): |
267 |
def __init__(self, schema, nfdomain): |
|
268 |
self.schema = schema |
|
269 |
# shortcuts |
|
270 |
self.rschema = schema.rschema |
|
271 |
self.eschema = schema.eschema |
|
272 |
# domain for non final variables |
|
273 |
self.nfdomain = nfdomain |
|
274 |
# {var: possible solutions set} |
|
275 |
self.varsols = {} |
|
276 |
# set of ambiguous variables |
|
277 |
self.ambiguousvars = set() |
|
278 |
# remember if a variable has been deambiguified by another to avoid |
|
279 |
# doing the opposite |
|
280 |
self.deambification_map = {} |
|
281 |
# not invariant variables (access to final.inlined relation) |
|
282 |
self.not_invariants = set() |
|
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delete-trailing-whitespace + some copyright update
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parents:
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diff
changeset
|
283 |
|
0 | 284 |
def is_ambiguous(self, var): |
285 |
return var in self.ambiguousvars |
|
286 |
||
287 |
def restrict(self, var, restricted_domain): |
|
288 |
self.varsols[var] &= restricted_domain |
|
289 |
if var in self.ambiguousvars and self.varsols[var] == var.stinfo['possibletypes']: |
|
290 |
self.ambiguousvars.remove(var) |
|
1802
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delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
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diff
changeset
|
291 |
|
0 | 292 |
def compute(self, rqlst): |
293 |
# set domains for each variable |
|
294 |
for varname, var in rqlst.defined_vars.iteritems(): |
|
5004
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Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4721
diff
changeset
|
295 |
if var.stinfo['uidrel'] is not None or \ |
3689
deb13e88e037
follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
3249
diff
changeset
|
296 |
self.eschema(rqlst.solutions[0][varname]).final: |
0 | 297 |
ptypes = var.stinfo['possibletypes'] |
298 |
else: |
|
299 |
ptypes = set(self.nfdomain) |
|
300 |
self.ambiguousvars.add(var) |
|
301 |
self.varsols[var] = ptypes |
|
302 |
if not self.ambiguousvars: |
|
303 |
return |
|
304 |
# apply relation restriction |
|
305 |
self.maydeambrels = maydeambrels = {} |
|
306 |
for rel in rqlst.iget_nodes(Relation): |
|
4287 | 307 |
if rel.r_type == 'eid' or rel.is_types_restriction(): |
0 | 308 |
continue |
309 |
lhs, rhs = rel.get_variable_parts() |
|
310 |
if isinstance(lhs, VariableRef) or isinstance(rhs, VariableRef): |
|
311 |
rschema = self.rschema(rel.r_type) |
|
3689
deb13e88e037
follow yams 0.25 api changes to improve performance
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
3249
diff
changeset
|
312 |
if rschema.inlined or rschema.final: |
0 | 313 |
self.not_invariants.add(lhs.variable) |
314 |
self.set_rel_constraint(lhs, rel, rschema.subjects) |
|
315 |
self.set_rel_constraint(rhs, rel, rschema.objects) |
|
316 |
# try to deambiguify more variables by considering other variables'type |
|
317 |
modified = True |
|
318 |
while modified and self.ambiguousvars: |
|
319 |
modified = False |
|
320 |
for var in self.ambiguousvars.copy(): |
|
321 |
try: |
|
322 |
for rel in (var.stinfo['relations'] & maydeambrels[var]): |
|
323 |
if self.deambiguifying_relation(var, rel): |
|
324 |
modified = True |
|
325 |
break |
|
326 |
except KeyError: |
|
327 |
# no relation to deambiguify |
|
328 |
continue |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1132
diff
changeset
|
329 |
|
0 | 330 |
def _debug_print(self): |
331 |
print 'varsols', dict((x, sorted(str(v) for v in values)) |
|
332 |
for x, values in self.varsols.iteritems()) |
|
333 |
print 'ambiguous vars', sorted(self.ambiguousvars) |
|
334 |
||
335 |
def set_rel_constraint(self, term, rel, etypes_func): |
|
336 |
if isinstance(term, VariableRef) and self.is_ambiguous(term.variable): |
|
337 |
var = term.variable |
|
5173
73760bbb66bd
[rql annotation] add test and fix for bug introduced by 5004:4cc020ee70e2. While it sounded good, it wasn't because stinfo['relations'] didn't include anymore stinfo['typerels']
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
5004
diff
changeset
|
338 |
if len(var.stinfo['relations']) == 1 \ |
5582
3e133b29a1a4
[rql2sql] follow rql 0.26.1 changes: NOT nodes normalization, allowing simplification of sql generation, and fix #XXX
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
5426
diff
changeset
|
339 |
or rel.scope is var.scope or rel.r_type == 'identity': |
0 | 340 |
self.restrict(var, frozenset(etypes_func())) |
341 |
try: |
|
342 |
self.maydeambrels[var].add(rel) |
|
343 |
except KeyError: |
|
344 |
self.maydeambrels[var] = set((rel,)) |
|
1802
d628defebc17
delete-trailing-whitespace + some copyright update
Adrien Di Mascio <Adrien.DiMascio@logilab.fr>
parents:
1132
diff
changeset
|
345 |
|
0 | 346 |
def deambiguifying_relation(self, var, rel): |
347 |
lhs, rhs = rel.get_variable_parts() |
|
348 |
onlhs = var is getattr(lhs, 'variable', None) |
|
349 |
other = onlhs and rhs or lhs |
|
350 |
otheretypes = None |
|
351 |
# XXX isinstance(other.variable, Variable) to skip column alias |
|
352 |
if isinstance(other, VariableRef) and isinstance(other.variable, Variable): |
|
353 |
deambiguifier = other.variable |
|
354 |
if not var is self.deambification_map.get(deambiguifier): |
|
5004
4cc020ee70e2
le patch rql26 a été importé
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4721
diff
changeset
|
355 |
if var.stinfo['typerel'] is None: |
0 | 356 |
otheretypes = deambiguifier.stinfo['possibletypes'] |
357 |
elif not self.is_ambiguous(deambiguifier): |
|
358 |
otheretypes = self.varsols[deambiguifier] |
|
359 |
elif deambiguifier in self.not_invariants: |
|
360 |
# we know variable won't be invariant, try to use |
|
361 |
# it to deambguify the current variable |
|
362 |
otheretypes = self.varsols[deambiguifier] |
|
5004
4cc020ee70e2
le patch rql26 a été importé
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4721
diff
changeset
|
363 |
if deambiguifier.stinfo['typerel'] is None: |
4285
ea590101691c
don't record deambiguifier when it has no type restriction using 'is', so we don't miss later some available constraints
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4212
diff
changeset
|
364 |
# if deambiguifier has no type restriction using 'is', |
ea590101691c
don't record deambiguifier when it has no type restriction using 'is', so we don't miss later some available constraints
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4212
diff
changeset
|
365 |
# don't record it |
ea590101691c
don't record deambiguifier when it has no type restriction using 'is', so we don't miss later some available constraints
Sylvain Thénault <sylvain.thenault@logilab.fr>
parents:
4212
diff
changeset
|
366 |
deambiguifier = None |
0 | 367 |
elif isinstance(other, Constant) and other.uidtype: |
368 |
otheretypes = (other.uidtype,) |
|
369 |
deambiguifier = None |
|
370 |
if otheretypes is not None: |
|
967 | 371 |
# to restrict, we must check that for all type in othertypes, |
372 |
# possible types on the other end of the relation are matching |
|
373 |
# variable's possible types |
|
0 | 374 |
rschema = self.rschema(rel.r_type) |
375 |
if onlhs: |
|
376 |
rtypefunc = rschema.subjects |
|
377 |
else: |
|
378 |
rtypefunc = rschema.objects |
|
379 |
for otheretype in otheretypes: |
|
380 |
reltypes = frozenset(rtypefunc(otheretype)) |
|
381 |
if var.stinfo['possibletypes'] != reltypes: |
|
4287 | 382 |
return False |
383 |
self.restrict(var, var.stinfo['possibletypes']) |
|
384 |
self.deambification_map[var] = deambiguifier |
|
385 |
return True |
|
0 | 386 |
return False |