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Refactor typcache.c's record typmod hash table.

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Previously, tuple descriptors were stored in chains keyed by a fixed size
array of OIDs.  That meant there were effectively two levels of collision
chain -- one inside and one outside the hash table.  Instead, let dynahash.c
look after conflicts for us by supplying a proper hash and equal function
pair.

This is a nice cleanup on its own, but also simplifies followup
changes allowing blessed TupleDescs to be shared between backends
participating in parallel query.

Author: Thomas Munro
Reviewed-By: Andres Freund
Discussion: https://postgr.es/m/CAEepm%3D34GVhOL%2BarUx56yx7OPk7%3DqpGsv3CpO54feqjAwQKm5g%40mail.gmail.com
This commit is contained in:
Andres Freund
2017-08-22 16:05:48 -07:00
parent 0052a0243d
commit 35ea75632a
3 changed files with 65 additions and 38 deletions
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2
src/include/access/tupdesc.h
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@@ -114,6 +114,8 @@ extern void DecrTupleDescRefCount(TupleDesc tupdesc);
extern bool equalTupleDescs(TupleDesc tupdesc1, TupleDesc tupdesc2);
extern uint32 hashTupleDesc(TupleDesc tupdesc);
extern void TupleDescInitEntry(TupleDesc desc,
AttrNumber attributeNumber,
const char *attributeName,