How to Achieve Pruning When Querying by Non-Partitioned Columns in PostgreSQL
3 days ago
- #PostgreSQL Optimization
- #Constraint Exclusion
- #Partition Pruning
- Partition pruning allows databases to eliminate entire partitions based on query predicates, traditionally only achievable with partition key columns.
- Using check constraints on non-partition key columns (e.g., session_id) can enable partition pruning by informing the optimizer about data ranges, similar to BRIN index minmax operators.
- Handling outliers in data ranges can be managed with multi-range check constraints (e.g., using OR conditions), inspired by PostgreSQL's multi-minmax operator, to maintain pruning effectiveness.