org.apache.phoenix.parse

Class CeilParseNode

java.lang.Object

org.apache.phoenix.parse.ParseNode

org.apache.phoenix.parse.CompoundParseNode

org.apache.phoenix.parse.FunctionParseNode

org.apache.phoenix.parse.CeilParseNode

public class CeilParseNode
extends FunctionParseNode

Parse node corresponding to CeilFunction. It also acts as a factory for creating the right kind of ceil expression according to the data type of the first child.

Since:

3.0.0

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.phoenix.parse.FunctionParseNode

FunctionParseNode.Argument, FunctionParseNode.BuiltInFunction, FunctionParseNode.BuiltInFunctionArgInfo, FunctionParseNode.BuiltInFunctionInfo, FunctionParseNode.FunctionClassType

Method Summary

Modifier and Type	Method and Description
Expression	create(List<Expression> children, StatementContext context) Entry point for parser to instantiate compiled representation of built-in function
boolean	evalToNullIfParamIsNull(StatementContext context, int index) When ceiling off decimals, user need not specify the scale.
static Expression	getCeilExpression(List<Expression> children)

Methods inherited from class org.apache.phoenix.parse.FunctionParseNode

accept, create, equals, getInfo, getName, hashCode, isAggregate, toSQL, validate, validateFunctionArguement

Methods inherited from class org.apache.phoenix.parse.CompoundParseNode

getChildren, isStateless

Methods inherited from class org.apache.phoenix.parse.ParseNode

getAlias, hasSubquery, toString

Methods inherited from class java.lang.Object

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

Method Detail

create

public Expression create(List<Expression> children,
                         StatementContext context)
                  throws SQLException

Description copied from class: FunctionParseNode

Entry point for parser to instantiate compiled representation of built-in function

Overrides:

create in class FunctionParseNode

Parameters:

children - Compiled expressions for child nodes

context - Query context for accessing state shared across the processing of multiple clauses

Returns:

compiled representation of built-in function

Throws:

SQLException

getCeilExpression

public static Expression getCeilExpression(List<Expression> children)
                                    throws SQLException

Throws:

SQLException

evalToNullIfParamIsNull

public boolean evalToNullIfParamIsNull(StatementContext context,
                                       int index)
                                throws SQLException

When ceiling off decimals, user need not specify the scale. In such cases, we need to prevent the function from getting evaluated as null. This is really a hack. A better way would have been if FunctionParseNode.BuiltInFunctionInfo provided a way of associating default values for each permissible data type. Something like: @ Argument(allowedTypes={PDataType.VARCHAR, PDataType.INTEGER}, defaultValues = {"null", "1"} isConstant=true) Till then, this will have to do.

Overrides:

evalToNullIfParamIsNull in class FunctionParseNode

index - index of parameter

Returns:

true if when the parameter at index is null, the function always evaluates to null and false otherwise.

Throws:

SQLException