org.apache.calcite.sql

Class SqlCallBinding

java.lang.Object

org.apache.calcite.sql.SqlOperatorBinding

org.apache.calcite.sql.SqlCallBinding

public class SqlCallBinding
extends SqlOperatorBinding

SqlCallBinding implements SqlOperatorBinding by analyzing to the operands of a SqlCall with a SqlValidator.

Field Summary

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

typeFactory

Constructor Summary

Constructors

Constructor and Description
SqlCallBinding(SqlValidator validator, SqlValidatorScope scope, SqlCall call) Creates a call binding.

Method Summary

Methods

Modifier and Type	Method and Description
SqlCall	getCall() Returns the call node.
String	getColumnListParamInfo(int ordinal, String paramName, List<String> columnList) Retrieves information about a column list parameter.
RelDataType	getCursorOperand(int ordinal) Returns the rowtype of the ordinalth operand, which is a cursor.
int	getGroupCount() If the operator call occurs in an aggregate query, returns the number of columns in the GROUP BY clause.
int	getIntLiteralOperand(int ordinal) Gets the integer value of a numeric literal operand.
int	getOperandCount()
RelDataType	getOperandType(int ordinal) Gets the type of a bound operand.
SqlValidatorScope	getScope() Returns the scope of the call.
String	getStringLiteralOperand(int ordinal) Gets the string value of a string literal operand.
SqlValidator	getValidator() Returns the validator.
boolean	isOperandNull(int ordinal, boolean allowCast) Determines whether a bound operand is NULL.
CalciteException	newError(Resources.ExInst<SqlValidatorException> e) Wraps a validation error with context appropriate to this operator call.
CalciteException	newValidationError(Resources.ExInst<SqlValidatorException> ex) Constructs a new validation error for the call.
CalciteException	newValidationSignatureError() Constructs a new validation signature error for the call.

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

collectOperandTypes, getOperator, getTypeFactory

Methods inherited from class java.lang.Object

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

Constructor Detail

SqlCallBinding

public SqlCallBinding(SqlValidator validator,
              SqlValidatorScope scope,
              SqlCall call)

Creates a call binding.

Parameters:

validator - Validator

scope - Scope of call

call - Call node

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

getValidator

public SqlValidator getValidator()

Returns the validator.

getScope

public SqlValidatorScope getScope()

Returns the scope of the call.

getCall

public SqlCall getCall()

Returns the call node.

getStringLiteralOperand

public String getStringLiteralOperand(int ordinal)

Description copied from class: SqlOperatorBinding

Gets the string value of a string literal operand.

Overrides:

getStringLiteralOperand in class SqlOperatorBinding

Parameters:

ordinal - zero-based ordinal of operand of interest

Returns:

string value

getIntLiteralOperand

public int getIntLiteralOperand(int ordinal)

Description copied from class: SqlOperatorBinding

Gets the integer value of a numeric literal operand.

Overrides:

getIntLiteralOperand in class SqlOperatorBinding

Parameters:

ordinal - zero-based ordinal of operand of interest

Returns:

integer value

isOperandNull

public boolean isOperandNull(int ordinal,
                    boolean allowCast)

Description copied from class: SqlOperatorBinding

Determines whether a bound operand is NULL.

This is only relevant for SQL validation.

Overrides:

isOperandNull in class SqlOperatorBinding

Parameters:

ordinal - zero-based ordinal of operand of interest

allowCast - whether to regard CAST(constant) as a constant

Returns:

whether operand is null; false for everything except SQL validation

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

getCursorOperand

public RelDataType getCursorOperand(int ordinal)

Description copied from class: SqlOperatorBinding

Returns the rowtype of the ordinalth operand, which is a cursor.

This is only implemented for SqlCallBinding.

Overrides:

getCursorOperand in class SqlOperatorBinding

Parameters:

ordinal - Ordinal of the operand

Returns:

Rowtype of the query underlying the cursor

getColumnListParamInfo

public String getColumnListParamInfo(int ordinal,
                            String paramName,
                            List<String> columnList)

Description copied from class: SqlOperatorBinding

Retrieves information about a column list parameter.

Overrides:

getColumnListParamInfo in class SqlOperatorBinding

Parameters:

ordinal - ordinal position of the column list parameter

paramName - name of the column list parameter

columnList - returns a list of the column names that are referenced in the column list parameter

Returns:

the name of the parent cursor referenced by the column list parameter if it is a column list parameter; otherwise, null is returned

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

newValidationSignatureError

public CalciteException newValidationSignatureError()

Constructs a new validation signature error for the call.

Returns:

signature exception

newValidationError

public CalciteException newValidationError(Resources.ExInst<SqlValidatorException> ex)

Constructs a new validation error for the call. (Do not use this to construct a validation error for other nodes such as an operands.)

Parameters:

ex - underlying exception

Returns:

wrapped exception