MaterializedViewIncrementalRewritingRelVisitor (Hive Query Language 4.0.0 API)

java.lang.Object
- org.apache.calcite.rel.RelVisitor
- - org.apache.hadoop.hive.ql.optimizer.calcite.rules.views.MaterializedViewIncrementalRewritingRelVisitor

```
public class MaterializedViewIncrementalRewritingRelVisitor
extends org.apache.calcite.rel.RelVisitor
```
This class is a helper to check whether a materialized view rebuild can be transformed from INSERT OVERWRITE to INSERT INTO. We are verifying that: 1) Plan only uses legal operators (i.e., Filter, Project, Join, and TableScan) 2) Whether the plane has aggregate 3) Whether the plane has an count(*) aggregate function call

Constructors
Constructor and Description
`MaterializedViewIncrementalRewritingRelVisitor()`

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`org.apache.calcite.rel.RelNode`	`go(org.apache.calcite.rel.RelNode p)` Starts an iteration.
`boolean`	`hasAllowedOperatorsOnly()`
`boolean`	`hasCountStar()`
`boolean`	`isContainsAggregate()`
`boolean`	`isInsertAllowedOnly()`
`void`	`visit(org.apache.calcite.rel.RelNode node, int ordinal, org.apache.calcite.rel.RelNode parent)`

Constructor Detail
- MaterializedViewIncrementalRewritingRelVisitor
```
public MaterializedViewIncrementalRewritingRelVisitor()
```

public void visit(org.apache.calcite.rel.RelNode node,
                  int ordinal,
                  org.apache.calcite.rel.RelNode parent)

public org.apache.calcite.rel.RelNode go(org.apache.calcite.rel.RelNode p)

Starts an iteration.

public boolean hasAllowedOperatorsOnly()

Class MaterializedViewIncrementalRewritingRelVisitor