Revert commit #15457. It is not a good solution to the problem I'm solving.

git-svn-id: https://svn.erp5.org/repos/public/erp5/trunk@15465 20353a03-c40f-0410-a6d1-a30d3c3de9de

product/ZSQLCatalog/SQLCatalog.py

@@ -258,13 +258,6 @@ class Query(QueryMixin):
   def __call__(self):
     self.asSQLExpression()
 
-  def __hash__(self):
-    value = self.value
-    if isinstance(value, list):
-      value = tuple(value)
-    return hash((self.format, self.operator, self.range, self.search_mode,
-                 self.table_alias_list, self.key, value, self.type))
-
   def getRange(self):
     return self.range
 
@@ -461,10 +454,6 @@ class ComplexQuery(QueryMixin):
   def __call__(self):
     self.asSQLExpression()
 
-  def __hash__(self):
-    subquery_hash = hash(tuple([hash(x) for x in self.getQueryList()]))
-    return hash((subquery_hash, self.operator))
-
   def getQueryList(self):
     return self.query_list