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IN clauses appearing at top level of WHERE can now be handled as joins.

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There are two implementation techniques: the executor understands a new
JOIN_IN jointype, which emits at most one matching row per left-hand row,
or the result of the IN's sub-select can be fed through a DISTINCT filter
and then joined as an ordinary relation.
Along the way, some minor code cleanup in the optimizer; notably, break
out most of the jointree-rearrangement preprocessing in planner.c and
put it in a new file prep/prepjointree.c.
This commit is contained in:
Tom Lane
2003-01-20 18:55:07 +00:00
parent be2b660ecd
commit bdfbfde1b1
47 changed files with 2075 additions and 875 deletions
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30
src/backend/nodes/outfuncs.c
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@ -8,7 +8,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.193 2003/01/15 19:35:39 tgl Exp $
* $Header: /cvsroot/pgsql/src/backend/nodes/outfuncs.c,v 1.194 2003/01/20 18:54:47 tgl Exp $
*
* NOTES
* Every node type that can appear in stored rules' parsetrees *must*
@ -905,6 +905,18 @@ _outMaterialPath(StringInfo str, MaterialPath *node)
WRITE_NODE_FIELD(subpath);
}
static void
_outUniquePath(StringInfo str, UniquePath *node)
{
WRITE_NODE_TYPE("UNIQUEPATH");
_outPathInfo(str, (Path *) node);
WRITE_NODE_FIELD(subpath);
WRITE_BOOL_FIELD(use_hash);
WRITE_FLOAT_FIELD(rows, "%.0f");
}
static void
_outNestPath(StringInfo str, NestPath *node)
{
@ -969,6 +981,16 @@ _outJoinInfo(StringInfo str, JoinInfo *node)
WRITE_NODE_FIELD(jinfo_restrictinfo);
}
static void
_outInClauseInfo(StringInfo str, InClauseInfo *node)
{
WRITE_NODE_TYPE("INCLAUSEINFO");
WRITE_INTLIST_FIELD(lefthand);
WRITE_INTLIST_FIELD(righthand);
WRITE_NODE_FIELD(sub_targetlist);
}
/*****************************************************************************
*
* Stuff from parsenodes.h.
@ -1563,6 +1585,9 @@ _outNode(StringInfo str, void *obj)
case T_MaterialPath:
_outMaterialPath(str, obj);
break;
case T_UniquePath:
_outUniquePath(str, obj);
break;
case T_NestPath:
_outNestPath(str, obj);
break;
@ -1581,6 +1606,9 @@ _outNode(StringInfo str, void *obj)
case T_JoinInfo:
_outJoinInfo(str, obj);
break;
case T_InClauseInfo:
_outInClauseInfo(str, obj);
break;
case T_CreateStmt:
_outCreateStmt(str, obj);