com.facebook.presto.spi.plan

Interface FilterStatsCalculatorService

public interface FilterStatsCalculatorService

Estimates the size of the data after applying a predicate using calculations compatible with Cost-Based Optimizer.

Method Summary

Modifier and Type	Method and Description
TableStatistics	filterStats(TableStatistics tableStatistics, RowExpression predicate, ConnectorSession session, Map<ColumnHandle,String> columnNames, Map<String,Type> columnTypes)

Method Detail

filterStats

TableStatistics filterStats(TableStatistics tableStatistics,
                            RowExpression predicate,
                            ConnectorSession session,
                            Map<ColumnHandle,String> columnNames,
                            Map<String,Type> columnTypes)

Parameters:

tableStatistics - Table-level and column-level statistics. Columns are identified using ColumnHandles.

predicate - Filter expression referring to columns by name

columnNames - Mapping from ColumnHandles used in tableStatistics to column names used in the predicate

columnTypes - Mapping from column names used in the predicate to column types