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hint: avoid duplicate hints in QBHintHandler #53921

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merged 6 commits into from
Jun 11, 2024
Merged

hint: avoid duplicate hints in QBHintHandler #53921

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hint: avoid duplicate hints in QBHintHandler
hawkingrei Jun 11, 2024
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hawkingrei Jun 11, 2024
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hawkingrei Jun 11, 2024
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hawkingrei Jun 11, 2024
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hawkingrei Jun 11, 2024
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hawkingrei Jun 11, 2024
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2 changes: 1 addition & 1 deletion pkg/planner/core/casetest/hint/BUILD.bazel
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Original file line number Diff line number Diff line change
Expand Up @@ -9,7 +9,7 @@ go_test(
],
data = glob(["testdata/**"]),
flaky = True,
shard_count = 7,
shard_count = 8,
deps = [
"//pkg/config",
"//pkg/domain",
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12 changes: 12 additions & 0 deletions pkg/planner/core/casetest/hint/hint_test.go
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Expand Up @@ -372,3 +372,15 @@ func TestHints(t *testing.T) {
tk.MustQuery("show warnings").Check(testkit.Rows(output[i].Warn...))
}
}

func TestQBHintHandlerDuplicateObjects(t *testing.T) {
store := testkit.CreateMockStore(t)
tk := testkit.NewTestKit(t, store)
tk.MustExec("use test")
tk.MustExec("CREATE TABLE t_employees (id INT NOT NULL AUTO_INCREMENT PRIMARY KEY, fname VARCHAR(25) NOT NULL, lname VARCHAR(25) NOT NULL, store_id INT NOT NULL, department_id INT NOT NULL);")
tk.MustExec("ALTER TABLE t_employees ADD INDEX idx(department_id);")

// Explain statement
tk.MustQuery("EXPLAIN WITH t AS (SELECT /*+ inl_join(e) */ em.* FROM t_employees em JOIN t_employees e WHERE em.store_id = e.department_id) SELECT * FROM t;")
tk.MustQuery("show warnings").Check(testkit.Rows())
}
5 changes: 4 additions & 1 deletion pkg/util/hint/hint_query_block.go
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Original file line number Diff line number Diff line change
Expand Up @@ -16,6 +16,7 @@ package hint

import (
"fmt"
"slices"
"strconv"
"strings"

Expand Down Expand Up @@ -295,7 +296,9 @@ func (p *QBHintHandler) GetCurrentStmtHints(hints []*ast.TableOptimizerHint, cur
}
continue
}
p.QBOffsetToHints[offset] = append(p.QBOffsetToHints[offset], hint)
if !slices.Contains(p.QBOffsetToHints[offset], hint) {
p.QBOffsetToHints[offset] = append(p.QBOffsetToHints[offset], hint)
}
}
return p.QBOffsetToHints[currentOffset]
}
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