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Revise aggregate functions per earlier discussions in pghackers.
There's now only one transition value and transition function. NULL handling in aggregates is a lot cleaner. Also, use Numeric accumulators instead of integer accumulators for sum/avg on integer datatypes --- this avoids overflow at the cost of being a little slower. Implement VARIANCE() and STDDEV() aggregates in the standard backend. Also, enable new LIKE selectivity estimators by default. Unrelated change, but as long as I had to force initdb anyway...
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@ -8,7 +8,7 @@
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*
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*
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* IDENTIFICATION
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* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.92 2000/07/12 02:37:06 tgl Exp $
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* $Header: /cvsroot/pgsql/src/backend/nodes/readfuncs.c,v 1.93 2000/07/17 03:05:01 tgl Exp $
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*
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* NOTES
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* Most of the read functions for plan nodes are tested. (In fact, they
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@ -1117,10 +1117,6 @@ _readAggref()
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token = lsptok(NULL, &length); /* eat :target */
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local_node->target = nodeRead(true); /* now read it */
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token = lsptok(NULL, &length); /* eat :usenulls */
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token = lsptok(NULL, &length); /* get usenulls */
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local_node->usenulls = (token[0] == 't') ? true : false;
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token = lsptok(NULL, &length); /* eat :aggstar */
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token = lsptok(NULL, &length); /* get aggstar */
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local_node->aggstar = (token[0] == 't') ? true : false;
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