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Attempt to omit ORDER BY clauses from FROM-clause subqueries if those ORDER BY

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clauses do not affect the output.  See
[forum:/forumpost/2d76f2bcf65d256a|forum thread 2d76f2bcf65d256a] for
discussion.  This can help the query flattener in
some cases, resulting in faster query plans.  The current implemention does
not always work.

FossilOrigin-Name: ef97c3e7c3ea2cf1a4db6591328fe7ce3f1d189afc2d578159135824ec89e620
This commit is contained in:
drh
2021-07-15 19:29:43 +00:00
parent 480f5e3e6e
commit bb30123178
7 changed files with 98 additions and 57 deletions
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9
src/func.c
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@@ -2160,11 +2160,11 @@ void sqlite3RegisterBuiltinFunctions(void){
FUNCTION(min, -1, 0, 1, minmaxFunc ),
FUNCTION(min, 0, 0, 1, 0 ),
WAGGREGATE(min, 1, 0, 1, minmaxStep, minMaxFinalize, minMaxValue, 0,
SQLITE_FUNC_MINMAX ),
SQLITE_FUNC_MINMAX|SQLITE_FUNC_ANYORDER ),
FUNCTION(max, -1, 1, 1, minmaxFunc ),
FUNCTION(max, 0, 1, 1, 0 ),
WAGGREGATE(max, 1, 1, 1, minmaxStep, minMaxFinalize, minMaxValue, 0,
SQLITE_FUNC_MINMAX ),
SQLITE_FUNC_MINMAX|SQLITE_FUNC_ANYORDER ),
FUNCTION2(typeof, 1, 0, 0, typeofFunc, SQLITE_FUNC_TYPEOF),
FUNCTION2(length, 1, 0, 0, lengthFunc, SQLITE_FUNC_LENGTH),
FUNCTION(instr, 2, 0, 0, instrFunc ),
@@ -2200,9 +2200,10 @@ void sqlite3RegisterBuiltinFunctions(void){
WAGGREGATE(total, 1,0,0, sumStep,totalFinalize,totalFinalize,sumInverse, 0),
WAGGREGATE(avg, 1,0,0, sumStep, avgFinalize, avgFinalize, sumInverse, 0),
WAGGREGATE(count, 0,0,0, countStep,
countFinalize, countFinalize, countInverse, SQLITE_FUNC_COUNT ),
countFinalize, countFinalize, countInverse,
SQLITE_FUNC_COUNT|SQLITE_FUNC_ANYORDER ),
WAGGREGATE(count, 1,0,0, countStep,
countFinalize, countFinalize, countInverse, 0 ),
countFinalize, countFinalize, countInverse, SQLITE_FUNC_ANYORDER ),
WAGGREGATE(group_concat, 1, 0, 0, groupConcatStep,
groupConcatFinalize, groupConcatValue, groupConcatInverse, 0),
WAGGREGATE(group_concat, 2, 0, 0, groupConcatStep,