( This is a sub-issue of #18 )

• SPI and engine changes for aggregation pushdown SPI and engine changes for aggregation pushdown #3697
• base-JDBC support for aggregation pushdown (Aggregation pushdown in PostgreSQL, base-jdbc #3881)
• Eliminate pushed down filters in JDBC connectors Eliminate pushed down filters in JDBC connectors #4111
• Aggregation pushdown for partial aggregations
• Aggregation pushdown with expressions Aggregation pushdown with expressions #4171
• Aggregation pushdown with coercions Aggregation pushdown with coercions #4170
• Trino aggregate pushdown rule should support grouping sets Trino aggregate pushdown rule should support grouping sets #4325
• Push down aggregation through filter into table scan Push down aggregation through filter into table scan #4113
• Fix aggregation function alias pushdown Fix aggregation function alias pushdown #6189
• Allow predicate pushdown after aggregation pushdown in JDBC connectors Allow predicate pushdown after aggregation pushdown in JDBC connectors #4112
• aggregation pushdown in PostgreSQL (Aggregation pushdown in PostgreSQL, base-jdbc #3881)
  • Incorrect aggregation result when grouping by PostgreSQL TIME in presence of 24:00:00 values Incorrect aggregation result when grouping by PostgreSQL TIME in presence of 24:00:00 values #5339
• aggregation pushdown in MySQL (Aggregation pushdown in MySQL connector #4138)
• aggregation pushdown in SQL Server (Aggregation pushdown in SQL Server connector #4139, Eliminate pushed down filters above JDBC TableScan in SQL Server connector #5241)
• aggregation pushdown in Redshift (Aggregation pushdown in Redshift connector #8915)
• aggregation pushdown in Druid (Implement aggregation pushdown in Druid #4109)
• aggregation pushdown in Pinot (Aggregation pushdown in Pinot connector #4140)
• aggregation pushdown in MongoDB (Aggregation pushdown in MongoDB connector #7285)
• ...