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expression: implement unhex function pushdown to tiflash #39898

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Merged
merged 5 commits into from
Dec 30, 2022
Merged

expression: implement unhex function pushdown to tiflash #39898

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ce03e3a
feat: push down unhex function to tiflash
b41sh Dec 13, 2022
9ef01d3
fix test
b41sh Dec 13, 2022
9bb5265
Merge branch 'master' into feat-unhex-pushdown
b41sh Dec 13, 2022
609d628
Merge branch 'master' into feat-unhex-pushdown
b41sh Dec 13, 2022
dd76490
Merge branch 'master' into feat-unhex-pushdown
hawkingrei Dec 14, 2022
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5 changes: 5 additions & 0 deletions expression/expr_to_pb_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -1239,6 +1239,11 @@ func TestExprPushDownToFlash(t *testing.T) {
require.Equal(t, tipb.ScalarFuncSig_CastTimeAsDuration, function.(*ScalarFunction).Function.PbCode())
exprs = append(exprs, function)

// Unhex
function, err = NewFunction(mock.NewContext(), ast.Unhex, types.NewFieldType(mysql.TypeString), stringColumn)
require.NoError(t, err)
exprs = append(exprs, function)

pushed, remained = PushDownExprs(sc, exprs, client, kv.TiFlash)
require.Len(t, pushed, len(exprs))
require.Len(t, remained, 0)
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2 changes: 1 addition & 1 deletion expression/expression.go
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Expand Up @@ -1267,7 +1267,7 @@ func scalarExprSupportedByFlash(function *ScalarFunction) bool {
}
case ast.IsTruthWithNull, ast.IsTruthWithoutNull, ast.IsFalsity:
return true
case ast.Hex, ast.Bin:
case ast.Hex, ast.Unhex, ast.Bin:
return true
case ast.GetFormat:
return true
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33 changes: 33 additions & 0 deletions planner/core/integration_test.go
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Expand Up @@ -7520,6 +7520,39 @@ func TestCastTimeAsDurationToTiFlash(t *testing.T) {
tk.MustQuery("explain select cast(a as time), cast(b as time) from t;").CheckAt([]int{0, 2, 4}, rows)
}

func TestUnhexPushDownToTiFlash(t *testing.T) {
store, dom := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)

tk.MustExec("use test")
tk.MustExec("drop table if exists t")
tk.MustExec("create table t(a int, b varchar(20));")
tk.MustExec("insert into t values(6162, '7469666C617368');")
tk.MustExec("set @@tidb_allow_mpp=1; set @@tidb_enforce_mpp=1;")
tk.MustExec("set @@tidb_isolation_read_engines = 'tiflash'")

tbl, err := dom.InfoSchema().TableByName(model.CIStr{O: "test", L: "test"}, model.CIStr{O: "t", L: "t"})
require.NoError(t, err)
// Set the hacked TiFlash replica for explain tests.
tbl.Meta().TiFlashReplica = &model.TiFlashReplicaInfo{Count: 1, Available: true}

rows := [][]interface{}{
{"TableReader_9", "root", "data:ExchangeSender_8"},
{"└─ExchangeSender_8", "mpp[tiflash]", "ExchangeType: PassThrough"},
{" └─Projection_4", "mpp[tiflash]", "unhex(cast(test.t.a, var_string(20)))->Column#4"},
{" └─TableFullScan_7", "mpp[tiflash]", "keep order:false, stats:pseudo"},
}
tk.MustQuery("explain select unhex(a) from t;").CheckAt([]int{0, 2, 4}, rows)

rows = [][]interface{}{
{"TableReader_9", "root", "data:ExchangeSender_8"},
{"└─ExchangeSender_8", "mpp[tiflash]", "ExchangeType: PassThrough"},
{" └─Projection_4", "mpp[tiflash]", "unhex(test.t.b)->Column#4"},
{" └─TableFullScan_7", "mpp[tiflash]", "keep order:false, stats:pseudo"},
}
tk.MustQuery("explain select unhex(b) from t;").CheckAt([]int{0, 2, 4}, rows)
}

func TestPartitionTableFallBackStatic(t *testing.T) {
store, _ := testkit.CreateMockStoreAndDomain(t)
tk := testkit.NewTestKit(t, store)
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