CalcSplitRule (Apache Calcite API)

java.lang.Object
- org.apache.calcite.plan.RelOptRule
- - org.apache.calcite.rel.rules.CalcSplitRule

```
public class CalcSplitRule
extends RelOptRule
```
Planner rule that converts a Calc to a Project and Filter.
Not enabled by default, as it works against the usual flow, which is to convert Project and Filter to Calc. But useful for specific tasks, such as optimizing before calling an Interpreter.

- Field Summary
  
  Fields
  Modifier and Type Field Description
  
  static CalcSplitRule INSTANCE
  - Fields inherited from class org.apache.calcite.plan.RelOptRule
    description, operands, relBuilderFactory
- Constructor Summary
  
  Constructors
  Constructor Description
  
  CalcSplitRule(RelBuilderFactory relBuilderFactory)
  Creates a CalcSplitRule.
- Method Summary
  
  All Methods Instance Methods Concrete Methods
  Modifier and Type Method Description
  
  void onMatch(RelOptRuleCall call)
  Receives notification about a rule match.
  - Methods inherited from class org.apache.calcite.plan.RelOptRule
    any, convert, convert, convertList, convertOperand, convertOperand, equals, equals, getOperand, getOperands, getOutConvention, getOutTrait, hashCode, matches, none, operand, operand, operand, operand, operand, operandJ, operandJ, some, toString, unordered
  - Methods inherited from class java.lang.Object
    clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Field Detail
  - INSTANCE
```
public static final CalcSplitRule INSTANCE
```
- Constructor Detail
  - CalcSplitRule
```
public CalcSplitRule(RelBuilderFactory relBuilderFactory)
```
    Creates a CalcSplitRule.
    
    Parameters:
    
    relBuilderFactory - Builder for relational expressions
- Method Detail
  - onMatch
```
public void onMatch(RelOptRuleCall call)
```
    Description copied from class: RelOptRule
    
    Receives notification about a rule match. At the time that this method is called, call.rels holds the set of relational expressions which match the operands to the rule; call.rels[0] is the root expression.
    Typically a rule would check that the nodes are valid matches, creates a new expression, then calls back RelOptRuleCall.transformTo(org.apache.calcite.rel.RelNode, java.util.Map<org.apache.calcite.rel.RelNode, org.apache.calcite.rel.RelNode>) to register the expression.
    
    Specified by:
    
    onMatch in class RelOptRule
    
    Parameters:
    
    call - Rule call
    
    See Also:
    
    RelOptRule.matches(RelOptRuleCall)