Kamil Endruszkiewicz

Tornado benchmark

3

1. Usage of `tornado.web.asynchronous` instead of `gen.coroutine` 2. You don't setup backlog for tornado 3. You can pass data to be written to finish instead of write + finish.

Use boolean or aggregation in correlated exists

1

## Description Improve performance of correlated exists by using bool_or aggregation function. ## Additional context and related issues ## Release notes (X) This is not user-visible or is docs only,...

Use only the biggest cardinality symbol for forced exchange

1

## Description The exchange below group-id is not beneficial if it doesn't help partial aggregation to be more efficient. This can happen if partitions by columns that would otherwise be...

## Description Allow to wait for more than one DF in Kudu ## Additional context and related issues ## Release notes ( ) This is not user-visible or is docs...

## Description Improve performance of distinct aggregations by defining additional strategies based on source properties (for example, NDV). The strategy to use for multiple distinct aggregations. `SINGLE_STEP` Computes distinct aggregations...

Add preferred timeout for small dynamic filters

6

## Description Add a CBO rule to estimate if dynamic filter is worth waiting for. Focus on small tables that are most often used as dimension tables and nodes that...

## Description Introduce new rule that splits distinct aggregations on different arguments to sub-queries and joins the grouped results using grouping keys if any. This allows `SingleDistinctAggregationToGroupBy` to kick in...

## Description Use assertJ approach to TestJsonStringArrayExtractScalar ## Additional context and related issues ## Release notes (X) This is not user-visible or is docs only, and no release notes are...

Enable large dynamic filters

8

## Description Enable large dynamic filters with increased limits. ## Additional context and related issues ## Release notes ( ) This is not user-visible or is docs only, and no...