java.lang.Object
- org.apache.flink.table.types.logical.utils.LogicalTypeMerging

@Internal
public final class LogicalTypeMerging
extends Object

Utilities for merging multiple LogicalType.

Method Summary

All Methods Static Methods Concrete Methods
Modifier and Type	Method	Description
`static DecimalType`	`findAdditionDecimalType(int precision1, int scale1, int precision2, int scale2)`	Finds the result type of a decimal addition operation.
`static LogicalType`	`findAvgAggType(LogicalType argType)`	Finds the result type of a decimal average aggregation.
`static Optional<LogicalType>`	`findCommonType(List<LogicalType> types)`	Returns the most common, more general `LogicalType` for a given set of types.
`static DecimalType`	`findDivisionDecimalType(int precision1, int scale1, int precision2, int scale2)`	Finds the result type of a decimal division operation.
`static DecimalType`	`findModuloDecimalType(int precision1, int scale1, int precision2, int scale2)`	Finds the result type of a decimal modulo operation.
`static DecimalType`	`findMultiplicationDecimalType(int precision1, int scale1, int precision2, int scale2)`	Finds the result type of a decimal multiplication operation.
`static DecimalType`	`findRoundDecimalType(int precision, int scale, int round)`	Finds the result type of a decimal rounding operation.
`static LogicalType`	`findSumAggType(LogicalType argType)`	Finds the result type of a decimal sum aggregation.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

findCommonType
```
public static Optional<LogicalType> findCommonType(List<LogicalType> types)
```
Returns the most common, more general LogicalType for a given set of types. If such a type exists, all given types can be casted to this more general type.
For example: [INT, BIGINT, DECIMAL(2, 2)] would lead to DECIMAL(21, 2).
This class aims to be compatible with the SQL standard. It is inspired by Apache Calcite's SqlTypeFactoryImpl#leastRestrictive method.

findDivisionDecimalType

public static DecimalType findDivisionDecimalType(int precision1,
                                                  int scale1,
                                                  int precision2,
                                                  int scale2)

Finds the result type of a decimal division operation.

findModuloDecimalType

public static DecimalType findModuloDecimalType(int precision1,
                                                int scale1,
                                                int precision2,
                                                int scale2)

Finds the result type of a decimal modulo operation.

findMultiplicationDecimalType

public static DecimalType findMultiplicationDecimalType(int precision1,
                                                        int scale1,
                                                        int precision2,
                                                        int scale2)

Finds the result type of a decimal multiplication operation.

findAdditionDecimalType

public static DecimalType findAdditionDecimalType(int precision1,
                                                  int scale1,
                                                  int precision2,
                                                  int scale2)

Finds the result type of a decimal addition operation.

findRoundDecimalType

public static DecimalType findRoundDecimalType(int precision,
                                               int scale,
                                               int round)

Finds the result type of a decimal rounding operation.

findAvgAggType

public static LogicalType findAvgAggType(LogicalType argType)

Finds the result type of a decimal average aggregation.

findSumAggType

public static LogicalType findSumAggType(LogicalType argType)

Finds the result type of a decimal sum aggregation.

Class LogicalTypeMerging