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planner: don't put the handle column twice into the index column #18565

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merged 3 commits into from
Jul 21, 2020
Merged

planner: don't put the handle column twice into the index column #18565

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89a95dc
planner: don't put the handle column twice into the index column
winoros Jul 14, 2020
ef080ad
Merge branch 'master' into issue18564
winoros Jul 21, 2020
d33d393
Merge branch 'master' into issue18564
ti-srebot Jul 21, 2020
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11 changes: 11 additions & 0 deletions executor/join_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2090,3 +2090,14 @@ func (s *testSuiteJoinSerial) TestIssue18070(c *C) {
err = tk.QueryToErr("select /*+ inl_merge_join(t1)*/ * from t1 join t2 on t1.a = t2.a;")
c.Assert(strings.Contains(err.Error(), "Out Of Memory Quota!"), IsTrue)
}

func (s *testSuiteJoin1) TestIssue18564(c *C) {
tk := testkit.NewTestKit(c, s.store)
tk.MustExec("use test")
tk.MustExec("drop table if exists t1, t2")
tk.MustExec("create table t1(a int, b int, primary key(a), index idx(b,a));")
tk.MustExec("create table t2(a int, b int, primary key(a), index idx(b,a));")
tk.MustExec("insert into t1 values(1, 1)")
tk.MustExec("insert into t2 values(1, 1)")
tk.MustQuery("select /*+ INL_JOIN(t1) */ * from t1 FORCE INDEX (idx) join t2 on t1.b=t2.b and t1.a = t2.a").Check(testkit.Rows("1 1 1 1"))
}
13 changes: 11 additions & 2 deletions planner/core/logical_plans.go
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Expand Up @@ -813,8 +813,17 @@ func (ds *DataSource) fillIndexPath(path *util.AccessPath, conds []expression.Ex
if !path.Index.Unique && !path.Index.Primary && len(path.Index.Columns) == len(path.IdxCols) {
handleCol := ds.getPKIsHandleCol()
if handleCol != nil && !mysql.HasUnsignedFlag(handleCol.RetType.Flag) {
path.IdxCols = append(path.IdxCols, handleCol)
path.IdxColLens = append(path.IdxColLens, types.UnspecifiedLength)
alreadyHandle := false
for _, col := range path.IdxCols {
if col.ID == model.ExtraHandleID || col.Equal(nil, handleCol) {
alreadyHandle = true
}
}
// Don't add one column twice to the index. May cause unexpected errors.
if !alreadyHandle {
path.IdxCols = append(path.IdxCols, handleCol)
path.IdxColLens = append(path.IdxColLens, types.UnspecifiedLength)
}
}
}
if len(path.IdxCols) != 0 {
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