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Tom Lane 9511304752 Rearrange the querytree representation of ORDER BY/GROUP BY/DISTINCT items ... as per my recent proposal: 1. Fold SortClause and GroupClause into a single node type SortGroupClause. We were already relying on them to be struct-equivalent, so using two node tags wasn't accomplishing much except to get in the way of comparing items with equal(). 2. Add an "eqop" field to SortGroupClause to carry the associated equality operator. This is cheap for the parser to get at the same time it's looking up the sort operator, and storing it eliminates the need for repeated not-so-cheap lookups during planning. In future this will also let us represent GROUP/DISTINCT operations on datatypes that have hash opclasses but no btree opclasses (ie, they have equality but no natural sort order). The previous representation simply didn't work for that, since its only indicator of comparison semantics was a sort operator. 3. Add a hasDistinctOn boolean to struct Query to explicitly record whether the distinctClause came from DISTINCT or DISTINCT ON. This allows removing some complicated and not 100% bulletproof code that attempted to figure that out from the distinctClause alone. This patch doesn't in itself create any new capability, but it's necessary infrastructure for future attempts to use hash-based grouping for DISTINCT and UNION/INTERSECT/EXCEPT.		18 years ago
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adt	Rearrange the querytree representation of ORDER BY/GROUP BY/DISTINCT items	18 years ago
cache	Rearrange the querytree representation of ORDER BY/GROUP BY/DISTINCT items	18 years ago
error	Increase PG_SYSLOG_LIMIT (the max line length sent to syslog()) from 128 to	18 years ago
fmgr	Implement SQL-spec RETURNS TABLE syntax for functions.	18 years ago
hash	Reduce the need for frontend programs to include "postgres.h" by refactoring	18 years ago
init	Refactor XLogOpenRelation() and XLogReadBuffer() in preparation for relation	18 years ago
mb	Fix compiler warning introduced by recent patch. Tsk tsk.	18 years ago
misc	Use guc.c's parse_int() instead of pg_atoi() to parse fillfactor in	18 years ago
mmgr	Adjust things so that the query_string of a cached plan and the sourceText of	18 years ago
resowner	Improve our #include situation by moving pointer types away from the	18 years ago
sort	Add a few more DTrace probes to the backend.	18 years ago
time	Make sure we only try to free snapshots that have been passed through	18 years ago
.cvsignore	…
Gen_dummy_probes.sed	Add a few more DTrace probes to the backend.	18 years ago
Gen_fmgrtab.pl	Fix Gen_fmgrtab.sh to not rely on hard-wired knowledge of the column numbers	18 years ago
Gen_fmgrtab.sh	Fix Gen_fmgrtab.sh to not rely on hard-wired knowledge of the column numbers	18 years ago
Makefile	Add a few more DTrace probes to the backend.	18 years ago
probes.d	Add a few more DTrace probes to the backend.	18 years ago