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planner: make single partition table support index join on inner side (#19151) #19197

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merged 3 commits into from
Aug 21, 2020
Merged

planner: make single partition table support index join on inner side (#19151) #19197

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f470c41
cherry pick #19151 to release-4.0
lzmhhh123 Aug 14, 2020
ea4f9d6
fix conflicts
lzmhhh123 Aug 14, 2020
f58bb6e
Merge branch 'release-4.0' into release-4.0-030eab2bca29
ti-srebot Aug 21, 2020
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24 changes: 24 additions & 0 deletions executor/index_lookup_merge_join_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -64,3 +64,27 @@ func (s *testSuite9) TestIssue18631(c *C) {
"2 2 2 2 2 2 2 2",
"1 1 1 1 1 1 1 1"))
}

func (s *testSuiteAgg) TestIndexJoinOnSinglePartitionTable(c *C) {
// For issue 19145
tk := testkit.NewTestKitWithInit(c, s.store)
tk.MustExec("drop table if exists t1, t2")
tk.MustExec("create table t1 (c_int int, c_str varchar(40), primary key (c_int) ) partition by range (c_int) ( partition p0 values less than (10), partition p1 values less than maxvalue )")
tk.MustExec("create table t2 (c_int int, c_str varchar(40), primary key (c_int) ) partition by range (c_int) ( partition p0 values less than (10), partition p1 values less than maxvalue )")
tk.MustExec("insert into t1 values (1, 'Alice')")
tk.MustExec("insert into t2 values (1, 'Bob')")
sql := "select /*+ INL_MERGE_JOIN(t1,t2) */ * from t1 join t2 partition(p0) on t1.c_int = t2.c_int and t1.c_str < t2.c_str"
tk.MustQuery(sql).Check(testkit.Rows("1 Alice 1 Bob"))
rows := s.testData.ConvertRowsToStrings(tk.MustQuery("explain " + sql).Rows())
c.Assert(strings.Index(rows[0], "IndexMergeJoin"), Equals, 0)

sql = "select /*+ INL_HASH_JOIN(t1,t2) */ * from t1 join t2 partition(p0) on t1.c_int = t2.c_int and t1.c_str < t2.c_str"
tk.MustQuery(sql).Check(testkit.Rows("1 Alice 1 Bob"))
rows = s.testData.ConvertRowsToStrings(tk.MustQuery("explain " + sql).Rows())
c.Assert(strings.Index(rows[0], "IndexHashJoin"), Equals, 0)

sql = "select /*+ INL_JOIN(t1,t2) */ * from t1 join t2 partition(p0) on t1.c_int = t2.c_int and t1.c_str < t2.c_str"
tk.MustQuery(sql).Check(testkit.Rows("1 Alice 1 Bob"))
rows = s.testData.ConvertRowsToStrings(tk.MustQuery("explain " + sql).Rows())
c.Assert(strings.Index(rows[0], "IndexJoin"), Equals, 0)
}
2 changes: 2 additions & 0 deletions planner/core/exhaust_physical_plans.go
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Expand Up @@ -757,6 +757,8 @@ func (p *LogicalJoin) constructInnerTableScanTask(
rangeDecidedBy: outerJoinKeys,
KeepOrder: keepOrder,
Desc: desc,
physicalTableID: ds.physicalTableID,
isPartition: ds.isPartition,
}.Init(ds.ctx, ds.blockOffset)
ts.SetSchema(ds.schema.Clone())
if rowCount <= 0 {
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