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Commit9e7e29e

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First cut at doing LIKE/regex indexing optimization in
optimizer rather than parser. This has many advantages, such as notgetting fooled by chance uses of operator names ~ and ~~ (the operatorsare identified by OID now), and not creating useless comparison operationsin contexts where the comparisons will not actually be used as indexquals.The new code also recognizes exact-match LIKE and regex patterns, andproduces an = indexqual instead of >= and <=.This change does NOT fix the problem with non-ASCII locales: the codestill doesn't know how to generate an upper bound indexqual for non-ASCIIcollation order. But it's no worse than before, just the same deficiencyin a different place...Also, dike out loc_restrictinfo fields in Plan nodes. These were doingnothing useful in the absence of 'expensive functions' optimization,and they took a considerable amount of processing to fill in.
1 parent434df3f commit9e7e29e

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12 files changed

+635
-366
lines changed

12 files changed

+635
-366
lines changed

‎src/backend/nodes/copyfuncs.c

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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.88 1999/07/25 17:53:27 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/nodes/copyfuncs.c,v 1.89 1999/07/27 03:51:07 tgl Exp $
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*
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*-------------------------------------------------------------------------
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newnode->outerjoincost=from->outerjoincost;
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newnode->joinid=listCopy(from->joinid);
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Node_Copy(from,newnode,loc_restrictinfo);
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}
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/* ----------------

‎src/backend/nodes/freefuncs.c

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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/nodes/Attic/freefuncs.c,v 1.23 1999/07/25 17:53:27 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/nodes/Attic/freefuncs.c,v 1.24 1999/07/27 03:51:08 tgl Exp $
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*-------------------------------------------------------------------------
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@@ -750,7 +750,6 @@ FreePathFields(Path *node)
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freeObject(node->pathkeys);
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freeList(node->joinid);
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freeObject(node->loc_restrictinfo);
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}
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/* ----------------

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