org.apache.druid.sql.calcite.table

Class RowSignatures

java.lang.Object

org.apache.druid.sql.calcite.table.RowSignatures

public class RowSignatures
extends Object

Utility functions for working with RowSignature.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RowSignatures.ComplexSqlType Calcite RelDataType for Druid complex columns, to preserve complex type information.

Method Summary

Modifier and Type	Method and Description
static RowSignature	fromRelDataType(List<String> rowOrder, org.apache.calcite.rel.type.RelDataType rowType)
static StringComparator	getNaturalStringComparator(RowSignature rowSignature, SimpleExtraction simpleExtraction) Return the "natural" StringComparator for an extraction from a row signature.
static org.apache.calcite.rel.type.RelDataType	makeComplexType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory, ColumnType columnType, boolean isNullable) Creates a RowSignatures.ComplexSqlType using the supplied RelDataTypeFactory to ensure that the RowSignatures.ComplexSqlType is interned.
static org.apache.calcite.rel.type.RelDataType	toRelDataType(RowSignature rowSignature, org.apache.calcite.rel.type.RelDataTypeFactory typeFactory) Returns a Calcite RelDataType corresponding to a row signature.
static org.apache.calcite.rel.type.RelDataType	toRelDataType(RowSignature rowSignature, org.apache.calcite.rel.type.RelDataTypeFactory typeFactory, boolean typecastTimeColumn) Returns a Calcite RelDataType corresponding to a row signature.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

fromRelDataType

public static RowSignature fromRelDataType(List<String> rowOrder,
                                           org.apache.calcite.rel.type.RelDataType rowType)

getNaturalStringComparator

@Nonnull
public static StringComparator getNaturalStringComparator(RowSignature rowSignature,
                                                                   SimpleExtraction simpleExtraction)

Return the "natural" StringComparator for an extraction from a row signature. This will be a lexicographic comparator for String types and a numeric comparator for Number types.

toRelDataType

public static org.apache.calcite.rel.type.RelDataType toRelDataType(RowSignature rowSignature,
                                                                    org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Returns a Calcite RelDataType corresponding to a row signature. It will typecast __time column to TIMESTAMP irrespective of the type present in the row signature

toRelDataType

public static org.apache.calcite.rel.type.RelDataType toRelDataType(RowSignature rowSignature,
                                                                    org.apache.calcite.rel.type.RelDataTypeFactory typeFactory,
                                                                    boolean typecastTimeColumn)

Returns a Calcite RelDataType corresponding to a row signature. For columns that are named "__time", it automatically casts it to TIMESTAMP if typecastTimeColumn is set to true

makeComplexType

public static org.apache.calcite.rel.type.RelDataType makeComplexType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory,
                                                                      ColumnType columnType,
                                                                      boolean isNullable)

Creates a RowSignatures.ComplexSqlType using the supplied RelDataTypeFactory to ensure that the RowSignatures.ComplexSqlType is interned. This is important because Calcite checks that the references are equal instead of the objects being equivalent. This method uses RelDataTypeFactory#createTypeWithNullability(RelDataType, boolean) ensures that if the type factory is a {@link org.apache.calcite.rel.type.RelDataTypeFactoryImpl} that the type is passed through {@link org.apache.calcite.rel.type.RelDataTypeFactoryImpl#canonize(RelDataType)} which interns the type.