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Support estimated count with multiple schemas (#22276)

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The `EstimateCount` could be incorrect when the table lives in multiple
schemas. Related to #19775.
This commit is contained in:
Jason Song 2022-12-31 02:25:58 +08:00 committed by GitHub
parent cf07f247b7
commit e5deeda0aa
Signed by: GitHub
GPG Key ID: 4AEE18F83AFDEB23
1 changed files with 4 additions and 1 deletions
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5
models/db/context.go
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@ -188,7 +188,10 @@ func EstimateCount(ctx context.Context, bean interface{}) (int64, error) {
case schemas.MYSQL:
_, err = e.Context(ctx).SQL("SELECT table_rows FROM information_schema.tables WHERE tables.table_name = ? AND tables.table_schema = ?;", tablename, x.Dialect().URI().DBName).Get(&rows)
case schemas.POSTGRES:
_, err = e.Context(ctx).SQL("SELECT reltuples AS estimate FROM pg_class WHERE relname = ?;", tablename).Get(&rows)
// the table can live in multiple schemas of a postgres database
// See https://wiki.postgresql.org/wiki/Count_estimate
tablename = x.TableName(bean, true)
_, err = e.Context(ctx).SQL("SELECT reltuples::bigint AS estimate FROM pg_class WHERE oid = ?::regclass;", tablename).Get(&rows)
case schemas.MSSQL:
_, err = e.Context(ctx).SQL("sp_spaceused ?;", tablename).Get(&rows)
default: