dan
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6a36f43586
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Do not consider a DISTINCT clause redundant unless a subset of the result-set is collectively subject to a UNIQUE constraint and it can be guaranteed that all columns of the subset are NOT NULL (either due to NOT NULL constraints WHERE clause terms). Fix for [385a5b56b9].
FossilOrigin-Name: 7b8548b1872cc1225355ba8311e93dd08d6526e2
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2012-04-20 16:59:24 +00:00 |
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dan
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2f56da3f26
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Changes to various test scripts so that veryquick.test runs with OMIT_COMPOUND_SELECT defined.
FossilOrigin-Name: 76bb649ee2633226324130f5898622c348f93769
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2012-02-13 10:00:35 +00:00 |
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drh
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33f111dc72
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Remove the undocumented PRAGMA omit_readlock hack.
FossilOrigin-Name: 96900c47e4fc6ed55cefc10d55d3d8d16bcb1d31
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2012-01-17 15:29:14 +00:00 |
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drh
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1c9d835d49
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Use OP_SorterOpen instead of OP_OpenEphemeral to implement GROUP BY.
FossilOrigin-Name: ebf819aaa555bd79fddfc0a6f9827a2539095d6c
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2011-09-01 16:01:27 +00:00 |
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dan
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94e08d92f9
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Fix a broken assert() in where.c.
FossilOrigin-Name: 090b29177fbc9faa83b560d92ddc3710d291776e
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2011-07-02 06:44:05 +00:00 |
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dan
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6f3439697e
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Improve use of indexes to optimize DISTINCT queries.
FossilOrigin-Name: 6c202ea0247ff509f696eee3839975a88ed26cf2
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2011-07-01 18:26:40 +00:00 |
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dan
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50118cdfdb
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Improvements and tests for detection of redundant DISTINCT qualifiers.
FossilOrigin-Name: 7337293c87fb563604dd6ad284f2d1e30c938b4c
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2011-07-01 14:21:38 +00:00 |