Package org.apache.drill.exec.planner.sql

Class TypeInferenceUtils

java.lang.Object

org.apache.drill.exec.planner.sql.TypeInferenceUtils

public class TypeInferenceUtils
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
static final TypeProtos.MajorType	UNKNOWN_TYPE

Method Summary

Modifier and Type	Method	Description
static FunctionCall	convertSqlOperatorBindingToFunctionCall(org.apache.calcite.sql.SqlOperatorBinding opBinding)	Given a SqlOperatorBinding, convert it to FunctionCall
static org.apache.calcite.rel.type.RelDataType	convertToCalciteType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory, TypeProtos.MajorType drillType, boolean isNullable)	Creates a RelDataType using specified RelDataTypeFactory which corresponds to specified TypeProtos.MajorType.
static org.apache.calcite.rel.type.RelDataType	createCalciteTypeWithNullability(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory, org.apache.calcite.sql.type.SqlTypeName sqlTypeName, boolean isNullable)	Given a SqlTypeName and nullability, create a RelDataType from the RelDataTypeFactory
static org.apache.calcite.sql.type.SqlTypeName	getCalciteTypeFromDrillType(TypeProtos.MinorType type)	Given a Drill's TypeProtos.MinorType, return a Calcite's corresponding SqlTypeName
static TypeProtos.MajorType	getDrillMajorTypeFromCalciteType(org.apache.calcite.rel.type.RelDataType relDataType)	Returns TypeProtos.MajorType instance which corresponds to specified RelDataType relDataType with its nullability, scale and precision if it is available.
static org.apache.calcite.sql.type.SqlReturnTypeInference	getDrillSqlReturnTypeInference(String name, List<DrillFuncHolder> functions)	Give the name and DrillFuncHolder list, return the inference mechanism.
static TypeProtos.MinorType	getDrillTypeFromCalciteType(org.apache.calcite.rel.type.RelDataType relDataType)	Given a Calcite's RelDataType, return a Drill's corresponding TypeProtos.MinorType
static TypeProtos.MinorType	getDrillTypeFromCalciteType(org.apache.calcite.sql.type.SqlTypeName sqlTypeName)	Given a Calcite's SqlTypeName, return a Drill's corresponding TypeProtos.MinorType
static org.apache.calcite.sql.type.SqlTypeName	getSqlTypeNameForTimeUnit(String timeUnitStr)	For Extract and date_part functions, infer the return types based on timeUnit
static boolean	isScalarStringType(org.apache.calcite.sql.type.SqlTypeName sqlTypeName)	Checks if given type is string scalar type.

Methods inherited from class java.lang.Object

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

Field Details

UNKNOWN_TYPE

public static final TypeProtos.MajorType UNKNOWN_TYPE

Method Details

getCalciteTypeFromDrillType

public static org.apache.calcite.sql.type.SqlTypeName getCalciteTypeFromDrillType(TypeProtos.MinorType type)

Given a Drill's TypeProtos.MinorType, return a Calcite's corresponding SqlTypeName

getDrillTypeFromCalciteType

public static TypeProtos.MinorType getDrillTypeFromCalciteType(org.apache.calcite.rel.type.RelDataType relDataType)

Given a Calcite's RelDataType, return a Drill's corresponding TypeProtos.MinorType

getDrillMajorTypeFromCalciteType

public static TypeProtos.MajorType getDrillMajorTypeFromCalciteType(org.apache.calcite.rel.type.RelDataType relDataType)

Returns TypeProtos.MajorType instance which corresponds to specified RelDataType relDataType with its nullability, scale and precision if it is available.

Parameters:

relDataType - RelDataType to convert

Returns:

TypeProtos.MajorType instance

getDrillTypeFromCalciteType

public static TypeProtos.MinorType getDrillTypeFromCalciteType(org.apache.calcite.sql.type.SqlTypeName sqlTypeName)

Given a Calcite's SqlTypeName, return a Drill's corresponding TypeProtos.MinorType

getDrillSqlReturnTypeInference

public static org.apache.calcite.sql.type.SqlReturnTypeInference getDrillSqlReturnTypeInference(String name,
 List<DrillFuncHolder> functions)

Give the name and DrillFuncHolder list, return the inference mechanism.

isScalarStringType

public static boolean isScalarStringType(org.apache.calcite.sql.type.SqlTypeName sqlTypeName)

Checks if given type is string scalar type.

Parameters:

sqlTypeName - Calcite's sql type name

Returns:

true if given type is string scalar type

getSqlTypeNameForTimeUnit

public static org.apache.calcite.sql.type.SqlTypeName getSqlTypeNameForTimeUnit(String timeUnitStr)

For Extract and date_part functions, infer the return types based on timeUnit

createCalciteTypeWithNullability

public static org.apache.calcite.rel.type.RelDataType createCalciteTypeWithNullability(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory,
 org.apache.calcite.sql.type.SqlTypeName sqlTypeName,
 boolean isNullable)

Given a SqlTypeName and nullability, create a RelDataType from the RelDataTypeFactory

Parameters:

typeFactory - RelDataTypeFactory used to create the RelDataType

sqlTypeName - the given SqlTypeName

isNullable - the nullability of the created RelDataType

Returns:

RelDataType Type of call

convertToCalciteType

public static org.apache.calcite.rel.type.RelDataType convertToCalciteType(org.apache.calcite.rel.type.RelDataTypeFactory typeFactory,
 TypeProtos.MajorType drillType,
 boolean isNullable)

Creates a RelDataType using specified RelDataTypeFactory which corresponds to specified TypeProtos.MajorType.

Parameters:

typeFactory - RelDataTypeFactory used to create the RelDataType

drillType - the given TypeProtos.MajorType

isNullable - nullability of the resulting type

Returns:

RelDataType which corresponds to specified TypeProtos.MajorType

convertSqlOperatorBindingToFunctionCall

public static FunctionCall convertSqlOperatorBindingToFunctionCall(org.apache.calcite.sql.SqlOperatorBinding opBinding)

Given a SqlOperatorBinding, convert it to FunctionCall

Parameters:

opBinding - the given SqlOperatorBinding

Returns:

FunctionCall the converted FunctionCall