org.apache.calcite.sql

Class SqlGroupedWindowFunction

java.lang.Object

org.apache.calcite.sql.SqlOperator

org.apache.calcite.sql.SqlFunction

org.apache.calcite.sql.SqlGroupedWindowFunction

public class SqlGroupedWindowFunction
extends SqlFunction

SQL function that computes keys by which rows can be partitioned and aggregated.

Grouped window functions always occur in the GROUP BY clause. They often have auxiliary functions that access information about the group. For example, HOP is a group function, and its auxiliary functions are HOP_START and HOP_END. Here they are used in a streaming query:

 SELECT STREAM HOP_START(rowtime, INTERVAL '1' HOUR),
   HOP_END(rowtime, INTERVAL '1' HOUR),
   MIN(unitPrice)
 FROM Orders
 GROUP BY HOP(rowtime, INTERVAL '1' HOUR), productId
 

Field Summary

Fields

Modifier and Type	Field and Description
SqlGroupedWindowFunction	groupFunction The grouped function, if this an auxiliary function; null otherwise.

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

kind, MDX_PRECEDENCE, NL

Constructor Summary

Constructors

Constructor and Description
SqlGroupedWindowFunction(SqlKind kind, SqlGroupedWindowFunction groupFunction, SqlOperandTypeChecker operandTypeChecker) Deprecated.
SqlGroupedWindowFunction(String name, SqlKind kind, SqlGroupedWindowFunction groupFunction, SqlOperandTypeChecker operandTypeChecker) Deprecated.
SqlGroupedWindowFunction(String name, SqlKind kind, SqlGroupedWindowFunction groupFunction, SqlReturnTypeInference returnTypeInference, SqlOperandTypeInference operandTypeInference, SqlOperandTypeChecker operandTypeChecker, SqlFunctionCategory category) Creates a SqlGroupedWindowFunction.

Method Summary

Modifier and Type	Method and Description
SqlGroupedWindowFunction	auxiliary(SqlKind kind) Creates an auxiliary function from this grouped window function.
SqlGroupedWindowFunction	auxiliary(String name, SqlKind kind) Creates an auxiliary function from this grouped window function.
List<SqlGroupedWindowFunction>	getAuxiliaryFunctions() Returns a list of this grouped window function's auxiliary functions.
SqlMonotonicity	getMonotonicity(SqlOperatorBinding call) Returns whether a call to this operator is monotonic.
boolean	isGroup() Returns whether this is a group function.
boolean	isGroupAuxiliary() Returns whether this is an group auxiliary function.

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

deriveType, getFunctionType, getNameAsId, getParamNames, getParamTypes, getSqlIdentifier, getSyntax, isQuantifierAllowed, unparse, validateCall, validateQuantifier

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

acceptCall, acceptCall, adjustType, allowsFraming, argumentMustBeScalar, checkOperandCount, checkOperandTypes, constructArgNameList, constructArgTypeList, constructOperandList, createCall, createCall, createCall, createCall, equals, getAllowedSignatures, getAllowedSignatures, getKind, getLeftPrec, getMonotonicity, getName, getOperandCountRange, getOperandTypeChecker, getOperandTypeInference, getReturnTypeInference, getRightPrec, getSignatureTemplate, hashCode, inferReturnType, inferReturnType, isAggregator, isDeterministic, isDynamicFunction, isName, leftPrec, needsSpace, preValidateCall, requiresDecimalExpansion, requiresOrder, requiresOver, rewriteCall, rightPrec, toString, unparseListClause, unparseListClause, validateOperands, validRexOperands

Methods inherited from class java.lang.Object

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

Field Detail

groupFunction

public final SqlGroupedWindowFunction groupFunction

The grouped function, if this an auxiliary function; null otherwise.

Constructor Detail

SqlGroupedWindowFunction

public SqlGroupedWindowFunction(String name,
                                SqlKind kind,
                                SqlGroupedWindowFunction groupFunction,
                                SqlReturnTypeInference returnTypeInference,
                                SqlOperandTypeInference operandTypeInference,
                                SqlOperandTypeChecker operandTypeChecker,
                                SqlFunctionCategory category)

Creates a SqlGroupedWindowFunction.

Parameters:

name - Function name

kind - Kind

groupFunction - Group function, if this is an auxiliary; null, if this is a group function

returnTypeInference - Strategy to use for return type inference

operandTypeInference - Strategy to use for parameter type inference

operandTypeChecker - Strategy to use for parameter type checking

category - Categorization for function

SqlGroupedWindowFunction

@Deprecated
public SqlGroupedWindowFunction(String name,
                                            SqlKind kind,
                                            SqlGroupedWindowFunction groupFunction,
                                            SqlOperandTypeChecker operandTypeChecker)

Deprecated.

SqlGroupedWindowFunction

@Deprecated
public SqlGroupedWindowFunction(SqlKind kind,
                                            SqlGroupedWindowFunction groupFunction,
                                            SqlOperandTypeChecker operandTypeChecker)

Deprecated.

Method Detail

auxiliary

public SqlGroupedWindowFunction auxiliary(SqlKind kind)

Creates an auxiliary function from this grouped window function.

Parameters:

kind - Kind; also determines function name

auxiliary

public SqlGroupedWindowFunction auxiliary(String name,
                                          SqlKind kind)

Creates an auxiliary function from this grouped window function.

Parameters:

name - Function name

kind - Kind

getAuxiliaryFunctions

public List<SqlGroupedWindowFunction> getAuxiliaryFunctions()

Returns a list of this grouped window function's auxiliary functions.

isGroup

public boolean isGroup()

Description copied from class: SqlOperator

Returns whether this is a group function.

Group functions can only appear in the GROUP BY clause.

Examples are HOP, TUMBLE, SESSION.

Group functions have auxiliary functions, e.g. HOP_START, but these are not group functions.

Overrides:

isGroup in class SqlOperator

isGroupAuxiliary

public boolean isGroupAuxiliary()

Description copied from class: SqlOperator

Returns whether this is an group auxiliary function.

Examples are HOP_START and HOP_END (both auxiliary to HOP).

Overrides:

isGroupAuxiliary in class SqlOperator

See Also:

SqlOperator.isGroup()

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