Package org.apache.calcite.sql.fun

Class SqlDatetimeSubtractionOperator

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlSpecialOperator

org.apache.calcite.sql.fun.SqlDatetimeSubtractionOperator

public class SqlDatetimeSubtractionOperator
extends SqlSpecialOperator

A special operator for the subtraction of two DATETIMEs. The format of DATETIME subtraction is:

"(" <datetime> "-" <datetime> ")" <interval qualifier>

This operator is special since it needs to hold the additional interval qualifier specification, when in SqlCall form. In RexNode form, it has only two parameters, and the return type describes the desired type of interval.

When being used for BigQuery's TIMESTAMP_SUB, TIME_SUB, and DATE_SUB operators, this operator subtracts an interval value from a timestamp value. The return type differs due to differing number of parameters and ordering. This is accounted for by passing in a SqlReturnTypeInference which is passed in by the standard MINUS_DATE and the library MINUS_DATE2 operators at their respective initializations.

Nested Class Summary

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

SqlSpecialOperator.ReduceResult, SqlSpecialOperator.TokenSequence

Field Summary

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor	Description
SqlDatetimeSubtractionOperator(String name, SqlReturnTypeInference returnTypeInference)

Method Summary

Modifier and Type	Method	Description
SqlMonotonicity	getMonotonicity(SqlOperatorBinding call)	Returns whether a call to this operator is monotonic.
void	unparse(SqlWriter writer, SqlCall call, int leftPrec, int rightPrec)	Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

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, deriveOperandType, deriveType, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getName, getNameAsId, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, getStrongPolicyInference, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isGroup, isGroupAuxiliary, isName, isSymmetrical, leftPrec, not, preValidateCall, requiresDecimalExpansion, 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 Details

SqlDatetimeSubtractionOperator

public SqlDatetimeSubtractionOperator(String name,
 SqlReturnTypeInference returnTypeInference)

Method Details

unparse

public void unparse(SqlWriter writer,
 SqlCall call,
 int leftPrec,
 int rightPrec)

Description copied from class: SqlOperator

Writes a SQL representation of a call to this operator to a writer, including parentheses if the operators on either side are of greater precedence.

The default implementation of this method delegates to SqlSyntax.unparse(org.apache.calcite.sql.SqlWriter, org.apache.calcite.sql.SqlOperator, org.apache.calcite.sql.SqlCall, int, int).

Overrides:

unparse in class SqlOperator

getMonotonicity

public SqlMonotonicity getMonotonicity(SqlOperatorBinding call)

Description copied from class: SqlOperator

Returns whether a call to this operator is monotonic.

Default implementation returns SqlMonotonicity.NOT_MONOTONIC.

Overrides:

getMonotonicity in class SqlOperator

Parameters:

call - Call to this operator with particular arguments and information about the monotonicity of the arguments