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Support estimated count with multiple schemas #22276

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Merged
merged 3 commits into from
Dec 30, 2022
Merged

Support estimated count with multiple schemas #22276

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6d60c44
feat: support estimate count for multiple schemas
wolfogre Dec 30, 2022
decf1c9
Update models/db/context.go
wolfogre Dec 30, 2022
e6e062d
Merge branch 'main' into feature/postgres_estimate_count
jolheiser Dec 30, 2022
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4 changes: 3 additions & 1 deletion models/db/context.go
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Original file line number Diff line number Diff line change
Expand Up @@ -188,7 +188,9 @@ 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
tablename = x.TableName(bean, true)
_, err = e.Context(ctx).SQL("SELECT reltuples::bigint AS estimate FROM pg_class WHERE oid = ?::regclass;", tablename).Get(&rows)
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Hmm, in the docs this is schema_name.table_name::, not table_name::.
Will this really work as intended?

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@wolfogre wolfogre Dec 30, 2022 •
edited
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The definition of x.TableName(bean, true):

// TableName returns table name with schema prefix if has
func (engine *Engine) TableName(bean interface{}, includeSchema ...bool) string {
	return dialects.FullTableName(engine.dialect, engine.GetTableMapper(), bean, includeSchema...)
}

And I have tested it, it works fine.

case schemas.MSSQL:
_, err = e.Context(ctx).SQL("sp_spaceused ?;", tablename).Get(&rows)
default:
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