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Enable projection pushdown #145

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Enable projection pushdown #145

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ba919eb
use conn instead of db
ichn-hu Aug 17, 2021
34781e5
Merge branch 'master' into enable-projection-pushdown
ichn-hu Apr 1, 2022
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3 changes: 3 additions & 0 deletions push-down-test/config/with_push_down/tidb.toml
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Original file line number Diff line number Diff line change
Expand Up @@ -5,3 +5,6 @@ socket = ""

[status]
report-status = false

[performance]
projection-push-down = true
2 changes: 2 additions & 0 deletions push-down-test/prepare/1_proj.sql
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@@ -0,0 +1,2 @@
CREATE TABLE proj_t0 (i int, t timestamp, s varchar(30));
INSERT into proj_t0 VALUES (1, '2021-08-19 12:53:05', 'good good study, day day up');
3 changes: 3 additions & 0 deletions push-down-test/sql/projection/1_basic_1.sql
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@@ -0,0 +1,3 @@
SELECT i + 1 FROM proj_t0;
SELECT DATE_FORMAT(t, '%Y-%m-%d %H') FROM proj_t0;
SELECT MD5(s) FROM proj_t0;
9 changes: 9 additions & 0 deletions push-down-test/src/main.go
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Expand Up @@ -148,6 +148,8 @@ func runTestCase(testCasePath string) bool {

func runStatements(logChan chan *statementLog, connString string, statements []string) {
db := mustDBOpen(connString, *dbName)
v := getSessionVariable(db, "tidb_opt_projection_push_down")
log.Printf("for %s tidb_opt_projection_push_down=%s\n", connString, v)
connID := getConnectionID(db)
for i, stmt := range statements {
runSingleStatement(stmt, i, db, connID, logChan)
Expand All @@ -163,6 +165,13 @@ func getConnectionID(db *sql.DB) uint64 {
return v
}

func getSessionVariable(db *sql.DB, varname string) string {
var v string
err := db.QueryRow(fmt.Sprintf("select @@%s;", varname)).Scan(&v)
expectNoErr(err)
return v
}

func runQuery(db *sql.DB, sql string) (string, error) {
rows, err := db.Query(sql)
buf := new(bytes.Buffer)
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