planner: support a hint to force using a IndexMerge path #12843
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Codecov Report
@@ Coverage Diff @@
## master #12843 +/- ##
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+ Coverage 80.0403% 80.1242% +0.0839%
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Files 474 474
Lines 116630 116695 +65
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+ Hits 93351 93501 +150
+ Misses 15897 15805 -92
- Partials 7382 7389 +7 |
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@eurekaka, it failed to add the test for |
alivxxx
reviewed
Oct 21, 2019
eurekaka
reviewed
Oct 22, 2019
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@eurekaka all the comments are fixed. |
eurekaka
reviewed
Oct 25, 2019
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@eurekaka all comments are fixed. |
alivxxx
reviewed
Oct 28, 2019
eurekaka
reviewed
Oct 28, 2019
eurekaka
reviewed
Nov 7, 2019
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@eurekaka all done |
alivxxx
reviewed
Nov 14, 2019
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@eurekaka @lamxTyler this has been somedays. If it is ok, I can solve the conflict and push it again. |
alivxxx
reviewed
Nov 26, 2019
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@eurekaka @lamxTyler it is finished. |
alivxxx
added
status/LGT2
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/run-all-tests |
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What problem does this PR solve?
Support a hint to access a table using IndexMerge way.
What is changed and how it works?
It is just like the other hints.
Check List
Tests
Code changes
Has exported function/method change
mainly change
func (ds *DataSource) accessPathsForCondsandfunc (ds *DataSource) DeriveStatsHas exported variable/fields change
tableHintInfoadds theindexMergeHintListfield.Datasourceadds theindexMergeHintfield.Side effects
Possible performance regression
Breaking backward compatibility