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Repair unstable regression test.

Commit0c882e5 tried to force table atest12 to have more-accurate-than-default statistics; but transiently setting default_statistics_targetisn't enough for that, because autovacuum could come along and overwritethe stats later. This evidently explains some intermittent buildfarmfailures we've seen since then. Repair by disabling autovac on this table.Thanks to David Rowley for correctly diagnosing the cause.Discussion:https://postgr.es/m/CA+hUKG+OUkQSOUTg=qo=S=fWa_tbm99i7rB7mfbHz1SYm4v-jQ@mail.gmail.com

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

2 files changed

-2

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

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -191,7 +191,8 @@ CREATE TABLE atest12 as`
`191`	`191`	`SELECT x AS a, 10001 - x AS b FROM generate_series(1,10000) x;`
`192`	`192`	`CREATE INDEX ON atest12 (a);`
`193`	`193`	`CREATE INDEX ON atest12 (abs(a));`
`194`		`--- results below depend on having quite accurate stats for atest12`
	`194`	`+-- results below depend on having quite accurate stats for atest12, so...`
	`195`	`+ALTER TABLE atest12 SET (autovacuum_enabled = off);`
`195`	`196`	`SET default_statistics_target = 10000;`
`196`	`197`	`VACUUM ANALYZE atest12;`
`197`	`198`	`RESET default_statistics_target;`

`‎src/test/regress/sql/privileges.sql`

Lines changed: 2 additions & 1 deletion

Original file line number	Diff line number	Diff line change
`@@ -136,7 +136,8 @@ CREATE TABLE atest12 as`
`136`	`136`	`SELECT xAS a,10001- xAS bFROM generate_series(1,10000) x;`
`137`	`137`	`CREATEINDEXON atest12 (a);`
`138`	`138`	`CREATEINDEXON atest12 (abs(a));`
`139`		`--- results below depend on having quite accurate stats for atest12`
	`139`	`+-- results below depend on having quite accurate stats for atest12, so...`
	`140`	`+ALTERTABLE atest12SET (autovacuum_enabled= off);`
`140`	`141`	`SET default_statistics_target=10000;`
`141`	`142`	`VACUUM ANALYZE atest12;`
`142`	`143`	`RESET default_statistics_target;`

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Commit6df8fb3

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2 files changed

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

`‎src/test/regress/sql/privileges.sql`

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