org.apache.calcite.sql.type

Class CompositeOperandTypeChecker

java.lang.Object

org.apache.calcite.sql.type.CompositeOperandTypeChecker

All Implemented Interfaces:

SqlOperandTypeChecker

Direct Known Subclasses:

CompositeSingleOperandTypeChecker

public class CompositeOperandTypeChecker
extends Object
implements SqlOperandTypeChecker

This class allows multiple existing SqlOperandTypeChecker rules to be combined into one rule. For example, allowing an operand to be either string or numeric could be done by:

 CompositeOperandsTypeChecking newCompositeRule =
  new CompositeOperandsTypeChecking(
    Composition.OR,
    new SqlOperandTypeChecker[]{stringRule, numericRule});

 

Similary a rule that would only allow a numeric literal can be done by:

 CompositeOperandsTypeChecking newCompositeRule =
  new CompositeOperandsTypeChecking(
    Composition.AND,
    new SqlOperandTypeChecker[]{numericRule, literalRule});

 

Finally, creating a signature expecting a string for the first operand and a numeric for the second operand can be done by:

 CompositeOperandsTypeChecking newCompositeRule =
  new CompositeOperandsTypeChecking(
    Composition.SEQUENCE,
    new SqlOperandTypeChecker[]{stringRule, numericRule});

 

For SEQUENCE composition, the rules must be instances of SqlSingleOperandTypeChecker, and signature generation is not supported. For AND composition, only the first rule is used for signature generation.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	CompositeOperandTypeChecker.Composition How operands are composed.

Nested classes/interfaces inherited from interface org.apache.calcite.sql.type.SqlOperandTypeChecker

SqlOperandTypeChecker.Consistency

Field Summary

Fields

Modifier and Type	Field and Description
protected com.google.common.collect.ImmutableList<? extends SqlOperandTypeChecker>	allowedRules
protected CompositeOperandTypeChecker.Composition	composition

Method Summary

Methods

Modifier and Type	Method and Description
boolean	checkOperandTypes(SqlCallBinding callBinding, boolean throwOnFailure) Checks the types of all operands to an operator call.
String	getAllowedSignatures(SqlOperator op, String opName) Returns a string describing the allowed formal signatures of a call, e.g.
SqlOperandTypeChecker.Consistency	getConsistency() Returns the strategy for making the arguments have consistency types.
SqlOperandCountRange	getOperandCountRange()
com.google.common.collect.ImmutableList<? extends SqlOperandTypeChecker>	getRules()

Methods inherited from class java.lang.Object

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

Field Detail

allowedRules

protected final com.google.common.collect.ImmutableList<? extends SqlOperandTypeChecker> allowedRules

composition

protected final CompositeOperandTypeChecker.Composition composition

Method Detail

getRules

public com.google.common.collect.ImmutableList<? extends SqlOperandTypeChecker> getRules()

getConsistency

public SqlOperandTypeChecker.Consistency getConsistency()

Description copied from interface: SqlOperandTypeChecker

Returns the strategy for making the arguments have consistency types.

Specified by:

getConsistency in interface SqlOperandTypeChecker

getAllowedSignatures

public String getAllowedSignatures(SqlOperator op,
                          String opName)

Description copied from interface: SqlOperandTypeChecker

Returns a string describing the allowed formal signatures of a call, e.g. "SUBSTR(VARCHAR, INTEGER, INTEGER)".

Specified by:

getAllowedSignatures in interface SqlOperandTypeChecker

Parameters:

op - the operator being checked

opName - name to use for the operator in case of aliasing

Returns:

generated string

getOperandCountRange

public SqlOperandCountRange getOperandCountRange()

Specified by:

getOperandCountRange in interface SqlOperandTypeChecker

Returns:

range of operand counts allowed in a call

checkOperandTypes

public boolean checkOperandTypes(SqlCallBinding callBinding,
                        boolean throwOnFailure)

Description copied from interface: SqlOperandTypeChecker

Checks the types of all operands to an operator call.

Specified by:

checkOperandTypes in interface SqlOperandTypeChecker

Parameters:

callBinding - description of the call to be checked

throwOnFailure - whether to throw an exception if check fails (otherwise returns false in that case)

Returns:

whether check succeeded