io.druid.sql.calcite.table

Class RowSignature

java.lang.Object

io.druid.sql.calcite.table.RowSignature

public class RowSignature
extends Object

Type signature for a row in a Druid dataSource ("DruidTable") or query result. Rows have an ordering and every column has a defined type. This is a little bit of a fiction in the Druid world (where rows do not _actually_ have well defined types) but we do impose types for the SQL layer.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	RowSignature.Builder

Method Summary

Modifier and Type	Method and Description
static RowSignature.Builder	builder()
boolean	equals(Object o)
static RowSignature	from(List<String> rowOrder, org.apache.calcite.rel.type.RelDataType rowType)
ValueType	getColumnType(String name)
org.apache.calcite.rel.type.RelDataType	getRelDataType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory) Returns a Calcite RelDataType corresponding to this row signature.
List<String>	getRowOrder() Returns the rowOrder for this signature, which is the list of column names in row order.
int	hashCode()
StringComparator	naturalStringComparator(SimpleExtraction simpleExtraction) Return the "natural" StringComparator for an extraction from this row signature.
String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Method Detail

from

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

builder

public static RowSignature.Builder builder()

getColumnType

public ValueType getColumnType(String name)

getRowOrder

public List<String> getRowOrder()

Returns the rowOrder for this signature, which is the list of column names in row order.

Returns:

row order

naturalStringComparator

@Nonnull
public StringComparator naturalStringComparator(SimpleExtraction simpleExtraction)

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

Parameters:

simpleExtraction - extraction from this kind of row

Returns:

natural comparator

getRelDataType

public org.apache.calcite.rel.type.RelDataType getRelDataType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory)

Returns a Calcite RelDataType corresponding to this row signature.

Parameters:

typeFactory - factory for type construction

Returns:

Calcite row type

equals

public boolean equals(Object o)

Overrides:

equals in class Object

hashCode

public int hashCode()

Overrides:

hashCode in class Object

toString

public String toString()

Overrides:

toString in class Object