org.apache.calcite.rel.core

Class Aggregate.AggCallBinding

java.lang.Object

org.apache.calcite.sql.SqlOperatorBinding

org.apache.calcite.rel.core.Aggregate.AggCallBinding

Enclosing class:

Aggregate

public static class Aggregate.AggCallBinding
extends SqlOperatorBinding

Implementation of the SqlOperatorBinding interface for an aggregate call applied to a set of operands in the context of a LogicalAggregate.

Field Summary

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

typeFactory

Constructor Summary

Constructors

Constructor and Description
Aggregate.AggCallBinding(RelDataTypeFactory typeFactory, SqlAggFunction aggFunction, List<RelDataType> operands, int groupCount) Creates an AggCallBinding

Method Summary

Methods

Modifier and Type	Method and Description
int	getGroupCount() If the operator call occurs in an aggregate query, returns the number of columns in the GROUP BY clause.
int	getOperandCount()
RelDataType	getOperandType(int ordinal) Gets the type of a bound operand.
CalciteException	newError(Resources.ExInst<SqlValidatorException> e) Wraps a validation error with context appropriate to this operator call.

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

collectOperandTypes, getColumnListParamInfo, getCursorOperand, getIntLiteralOperand, getOperator, getStringLiteralOperand, getTypeFactory, isOperandNull

Methods inherited from class java.lang.Object

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

Constructor Detail

Aggregate.AggCallBinding

public Aggregate.AggCallBinding(RelDataTypeFactory typeFactory,
                        SqlAggFunction aggFunction,
                        List<RelDataType> operands,
                        int groupCount)

Creates an AggCallBinding

Parameters:

typeFactory - Type factory

aggFunction - Aggregate function

operands - Data types of operands

groupCount - Number of columns in the GROUP BY clause

Method Detail

getGroupCount

public int getGroupCount()

Description copied from class: SqlOperatorBinding

If the operator call occurs in an aggregate query, returns the number of columns in the GROUP BY clause. For example, for "SELECT count(*) FROM emp GROUP BY deptno, gender", returns 2.

Returns 0 if the query is implicitly "GROUP BY ()" because of an aggregate expression. For example, "SELECT sum(sal) FROM emp".

Returns -1 if the query is not an aggregate query.

Overrides:

getGroupCount in class SqlOperatorBinding

getOperandCount

public int getOperandCount()

Specified by:

getOperandCount in class SqlOperatorBinding

Returns:

the number of bound operands

getOperandType

public RelDataType getOperandType(int ordinal)

Description copied from class: SqlOperatorBinding

Gets the type of a bound operand.

Specified by:

getOperandType in class SqlOperatorBinding

Parameters:

ordinal - zero-based ordinal of operand of interest

Returns:

bound operand type

newError

public CalciteException newError(Resources.ExInst<SqlValidatorException> e)

Description copied from class: SqlOperatorBinding

Wraps a validation error with context appropriate to this operator call.

Specified by:

newError in class SqlOperatorBinding

Parameters:

e - Validation error, not null

Returns:

Error wrapped, if possible, with positional information