author | Sylvain Thénault <sylvain.thenault@logilab.fr> |
Wed, 21 Apr 2010 16:53:47 +0200 | |
branch | stable |
changeset 5368 | d321e4b62a10 |
parent 4212 | ab6573088b4a |
child 5004 | 4cc020ee70e2 |
child 5421 | 8167de96c523 |
permissions | -rw-r--r-- |
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"""Defines the diferent querier steps usable in plans. |
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|
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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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|
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:organization: Logilab |
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update copyright: welcome 2010
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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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110 |
"""step consisting in making aggregat from temporary data in the system |
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111 |
source |
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112 |
""" |
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113 |
def __init__(self, plan, selection, select, table, outputtable=None): |
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114 |
Step.__init__(self, plan) |
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115 |
# original selection |
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116 |
self.selection = selection |
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117 |
# original Select RQL tree |
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118 |
self.select = select |
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119 |
# table where are located temporary results |
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120 |
self.table = table |
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121 |
# optional table where to write results |
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122 |
self.outputtable = outputtable |
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123 |
if outputtable is not None: |
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124 |
plan.init_temp_table(outputtable, selection, select.solutions[0]) |
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125 |
|
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126 |
#self.inputmap = inputmap |
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127 |
|
257
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128 |
def mytest_repr(self): |
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129 |
"""return a representation of this step suitable for test""" |
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130 |
sel = self.select.selection |
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131 |
restr = self.select.where |
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132 |
self.select.selection = self.selection |
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133 |
self.select.where = None |
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134 |
rql = self.select.as_string(kwargs=self.plan.args) |
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135 |
self.select.selection = sel |
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136 |
self.select.where = restr |
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137 |
try: |
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138 |
# rely on a monkey patch (cf unittest_querier) |
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139 |
table = self.plan.tablesinorder[self.table] |
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140 |
outputtable = self.outputtable and self.plan.tablesinorder[self.outputtable] |
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141 |
except AttributeError: |
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142 |
# not monkey patched |
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143 |
table = self.table |
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144 |
outputtable = self.outputtable |
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145 |
return (self.__class__.__name__, rql, self.limit, self.offset, table, |
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146 |
outputtable) |
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147 |
|
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148 |
def execute(self): |
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149 |
"""execute this step""" |
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150 |
self.execute_children() |
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151 |
self.inputmap = inputmap = self.children[-1].outputmap |
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152 |
# get the select clause |
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153 |
clause = [] |
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154 |
for i, term in enumerate(self.selection): |
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155 |
try: |
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156 |
var_name = inputmap[term.as_string()] |
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157 |
except KeyError: |
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158 |
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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161 |
# (for instance COUNT -> SUM) |
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162 |
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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166 |
orig_children = term.children |
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167 |
term.children = [VariableRef(Variable(var_name))] |
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168 |
clause.append(term.accept(self)) |
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169 |
# restaure the tree XXX necessary? |
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170 |
term.name = orig_name |
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171 |
term.children = orig_children |
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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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|
175 |
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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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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189 |
else: |
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190 |
grouped = None |
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191 |
if self.select.having: |
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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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195 |
if self.select.orderby: |
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196 |
clause = [] |
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197 |
for sortterm in self.select.orderby: |
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198 |
sqlterm = sortterm.term.accept(self) |
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199 |
if sortterm.asc: |
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200 |
clause.append(sqlterm) |
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201 |
else: |
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202 |
clause.append('%s DESC' % sqlterm) |
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203 |
if grouped is not None: |
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204 |
for vref in sortterm.iget_nodes(VariableRef): |
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205 |
if not vref.name in grouped: |
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206 |
sql[-1] += ', ' + self.inputmap[vref.name] |
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207 |
grouped.add(vref.name) |
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208 |
sql.append('ORDER BY %s' % ', '.join(clause)) |
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209 |
if self.limit: |
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210 |
sql.append('LIMIT %s' % self.limit) |
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211 |
if self.offset: |
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212 |
sql.append('OFFSET %s' % self.offset) |
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213 |
#print 'DATA', plan.sqlexec('SELECT * FROM %s' % self.table, None) |
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214 |
sql = ' '.join(sql) |
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215 |
if self.outputtable: |
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216 |
self.plan.create_temp_table(self.outputtable) |
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217 |
sql = 'INSERT INTO %s %s' % (self.outputtable, sql) |
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218 |
return self.plan.sqlexec(sql, self.plan.args) |
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219 |
|
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220 |
def visit_function(self, function): |
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221 |
"""generate SQL name for a function""" |
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222 |
return '%s(%s)' % (function.name, |
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','.join(c.accept(self) for c in function.children)) |
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def visit_variableref(self, variableref): |
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"""get the sql name for a variable reference""" |
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try: |
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return self.inputmap[variableref.name] |
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except KeyError: # XXX duh? explain |
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return variableref.variable.name |
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def visit_constant(self, constant): |
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"""generate SQL name for a constant""" |
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assert constant.type == 'Int' |
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return str(constant.value) |
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class UnionStep(LimitOffsetMixIn, Step): |
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"""union results of child in-memory steps (e.g. OneFetchStep / AggrStep)""" |
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def execute(self): |
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"""execute this step""" |
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result = [] |
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limit = olimit = self.limit |
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offset = self.offset |
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assert offset != 0 |
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if offset is not None: |
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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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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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|
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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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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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|
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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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|
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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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|
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|
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__all__ = ('FetchStep', 'AggrStep', 'UnionStep', 'UnionFetchStep', 'IntersectStep') |