org.apache.calcite.sql.fun

Class SqlRowOperator

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlSpecialOperator

org.apache.calcite.sql.fun.SqlRowOperator

public class SqlRowOperator
extends org.apache.calcite.sql.SqlSpecialOperator

Copied to keep null semantics of table api and sql in sync.

There are differences following:

1. The return value about R IS NULL and R IS NOT NULL.

At the same time SQL standard says that the next about `ROW`:

• The value of R IS NULL is:
  • If the value of every field of V is the null value, then True.
  • Otherwise, False.
• The value of R IS NOT NULL is:
  • If the value of no field of V is the null value, then True.
  • Otherwise, False.

Calcite applies that logic since CALCITE-3627 (1.30.0+).

• Thus, with Calcite 1.30.0+
  • SELECT ROW(CAST(NULL AS INT), CAST(NULL AS INT)) IS NOT NULL; -- returns FALSE
  • SELECT ROW(CAST(NULL AS INT), CAST(NULL AS INT)) IS NULL; -- returns TRUE.
• With Flink and Calcite before 1.30.0 (current behavior of this class)
  • SELECT ROW(CAST(NULL AS INT), CAST(NULL AS INT)) IS NOT NULL; -- returns TRUE
  • SELECT ROW(CAST(NULL AS INT), CAST(NULL AS INT)) IS NULL; -- returns FALSE

Once Flink applies same logic for both table api and sql, this first changes should be removed.

2. It uses StructKind.PEEK_FIELDS_NO_EXPAND with a nested struct type (Flink [[RowType]]).

See more at LogicalRelDataTypeConverter and FlinkTypeFactory.

Changed lines

1. Line 106 ~ 137

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.calcite.sql.SqlSpecialOperator

org.apache.calcite.sql.SqlSpecialOperator.ReduceResult, org.apache.calcite.sql.SqlSpecialOperator.TokenSequence

Field Summary

Fields inherited from class org.apache.calcite.sql.SqlOperator

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlRowOperator(String name)

Method Summary

Modifier and Type	Method and Description
org.apache.calcite.rel.type.RelDataType	inferReturnType(org.apache.calcite.sql.SqlOperatorBinding opBinding)
boolean	requiresDecimalExpansion()
void	unparse(org.apache.calcite.sql.SqlWriter writer, org.apache.calcite.sql.SqlCall call, int leftPrec, int rightPrec)

Methods inherited from class org.apache.calcite.sql.SqlSpecialOperator

getSyntax, reduceExpr

Methods inherited from class org.apache.calcite.sql.SqlOperator

acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, checkOperandTypes, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, createCall, createCall, createCall, deriveType, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getMonotonicity, getName, getNameAsId, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, getStrongPolicyInference, hashCode, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, leftPrec, not, preValidateCall, requiresOrder, requiresOver, reverse, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateCall, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlRowOperator

public SqlRowOperator(String name)

Method Detail

inferReturnType

public org.apache.calcite.rel.type.RelDataType inferReturnType(org.apache.calcite.sql.SqlOperatorBinding opBinding)

Overrides:

inferReturnType in class org.apache.calcite.sql.SqlOperator

unparse

public void unparse(org.apache.calcite.sql.SqlWriter writer,
                    org.apache.calcite.sql.SqlCall call,
                    int leftPrec,
                    int rightPrec)

Overrides:

unparse in class org.apache.calcite.sql.SqlOperator

requiresDecimalExpansion

public boolean requiresDecimalExpansion()

Overrides:

requiresDecimalExpansion in class org.apache.calcite.sql.SqlOperator