executor: add several sql hint related to session variables #11809
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## master #11809 +/- ##
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Coverage 81.6107% 81.6107%
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Files 455 455
Lines 101380 101380
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Hits 82737 82737
Misses 12852 12852
Partials 5791 5791 |
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PTAL. @qw4990 @lzmhhh123 |
foreyes
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PTAL. @qw4990 |
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Almost LGTM, and please address comments and resolve CI problems @foreyes . |
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/run-all-tests |
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Address comments and add some tests. PTAL again. @qw4990 |
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PTAL. @XuHuaiyu |
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/run-unit-test |
| c.Assert(tk.Se.GetSessionVars().StmtCtx.MemTracker.CheckBytesLimit(val), IsTrue) | ||
| tk.MustExec("select /*+ MEMORY_QUOTA(1 GB), MEMORY_QUOTA(1 MB) */ 1;") | ||
| val = int64(1) * 1024 * 1024 | ||
| c.Assert(tk.Se.GetSessionVars().StmtCtx.GetWarnings(), HasLen, 1) |
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May we check the warning msg?
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Warning messages need to be dealt with specially later, and there is no need to care too much about them at this stage.
| c.Assert(tk.Se.GetSessionVars().GetReplicaRead(), Equals, kv.ReplicaReadLeader) | ||
| } | ||
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| func (s *testSessionSuite) TestStmtHints(c *C) { |
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Should we add some test case with hints in subqueries?
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It's unlikely to support use these hints in subqueries.
These hints need to handle before sql execute and set statement variables, handle them in subquries is too expensive.
Maybe discuss with PM team later.
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address comment, add test and change a few codes. |
XuHuaiyu
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status/can-merge
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/run-all-tests |
What problem does this PR solve?
Add SQL hints:
MEMORY_QUOTA,USE_TOJA,NO_INDEX_MERGE,READ_CONSISTENT_REPLICAWhat is changed and how it works?
Extract sql hints before executing each query, and store hints in
StmtCtx.When we need access or set related session variables, we have to use interfaces instead.
For example, if there is ReplicaRead hint in StmtCtx,
GetReplicaRead()will return the value in StmtCtx, otherwise returnSessionVars.replicaRead.Check List
Tests
Code Changes
Release Notes
Support several SQL hints related to session variables: MEMORY_QUOTA, USE_TOJA, NO_INDEX_MERGE, READ_CONSISTENT_REPLICA.