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Avoid possible regression test instability in timestamp.sql.

Concurrent autovacuum could result in a change in the order of thelive rows in timestamp_tbl. While this would not happen with thedefault autovacuum parameters, it's fairly easy to hit ifautovacuum_vacuum_threshold is made small enough to allow autovacto decide to process this table. That's a stumbling block for tryingto exercise autovacuum aggressively using the core regression tests.To fix, replace an unqualified DELETE with a TRUNCATE. There's asimilar DELETE just above (and no order-sensitive queries between),so this doesn't lose any test coverage and might indeed be arguedto improve it.Discussion:https://postgr.es/m/17428.1555348950@sss.pgh.pa.us

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src/test/regress
- expected
  - timestamp.out
- sql
  - timestamp.sql

2 files changed

-2

lines changed

`‎src/test/regress/expected/timestamp.out‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -74,7 +74,7 @@ SELECT count(*) AS two FROM TIMESTAMP_TBL WHERE d1 = timestamp(2) without time z`
`74`	`74`	`(1 row)`
`75`	`75`
`76`	`76`	`COMMIT;`
`77`		`-DELETE FROM TIMESTAMP_TBL;`
	`77`	`+TRUNCATE TIMESTAMP_TBL;`
`78`	`78`	`-- Special values`
`79`	`79`	`INSERT INTO TIMESTAMP_TBL VALUES ('-infinity');`
`80`	`80`	`INSERT INTO TIMESTAMP_TBL VALUES ('infinity');`

`‎src/test/regress/sql/timestamp.sql‎`

Lines changed: 1 addition & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -44,7 +44,7 @@ SELECT pg_sleep(0.1);`
`44`	`44`	`SELECTcount(*)AS twoFROM TIMESTAMP_TBLWHERE d1=timestamp(2) without time zone'now';`
`45`	`45`	`COMMIT;`
`46`	`46`
`47`		`-DELETEFROM TIMESTAMP_TBL;`
	`47`	`+TRUNCATE TIMESTAMP_TBL;`
`48`	`48`
`49`	`49`	`-- Special values`
`50`	`50`	`INSERT INTO TIMESTAMP_TBLVALUES ('-infinity');`

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Commit47169c2

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2 files changed

2 files changed

`‎src/test/regress/expected/timestamp.out‎`

`‎src/test/regress/sql/timestamp.sql‎`

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