Package 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	Description
static final class	RowSignatures.ComplexSqlSingleOperandTypeChecker
static final class	RowSignatures.ComplexSqlType	Calcite RelDataType for Druid complex columns, to preserve complex type information.

Method Summary

Modifier and Type	Method	Description
static org.apache.calcite.rel.type.RelDataType	columnTypeToRelDataType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory, ColumnType columnType, boolean nullNumeric)	Returns a Calcite RelDataType corresponding to a ColumnType
static RowSignatures.ComplexSqlSingleOperandTypeChecker	complexTypeChecker(ColumnType complexType)
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 RowSignature.
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 RowSignature.

Methods inherited from class java.lang.Object

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

Method Details

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 RowSignature. 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 RowSignature. For columns that are named "__time", it automatically casts it to TIMESTAMP if typecastTimeColumn is set to true

columnTypeToRelDataType

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

Returns a Calcite RelDataType corresponding to a ColumnType

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 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.

complexTypeChecker

public static RowSignatures.ComplexSqlSingleOperandTypeChecker complexTypeChecker(ColumnType complexType)