HiveJoinConstraintsRule (Hive Query Language 4.0.0 API)

java.lang.Object
- org.apache.calcite.plan.RelOptRule
- - org.apache.hadoop.hive.ql.optimizer.calcite.rules.HiveJoinConstraintsRule

```
public class HiveJoinConstraintsRule
extends org.apache.calcite.plan.RelOptRule
```
The rule can perform two different optimizations. 1) Removes a join if is does not alter the cardinality of the one of its inputs. In particular, this rule is triggered if: - it is a join on PK-FK/UK-FK, - project on top only references columns from the FK side, and - PK/UK side is not filtered It optionally adds an IS NOT NULL filter if any FK column can be nullable 2) Transforms a left/right outer join into an inner join if: - it is a join on PK-FK/UK-FK, - FK is not nullable - PK/UK side is not filtered

Fields
Modifier and Type	Field and Description
`static HiveJoinConstraintsRule`	`INSTANCE`
`protected static org.slf4j.Logger`	`LOG`

Constructors
Modifier	Constructor and Description
`protected`	`HiveJoinConstraintsRule(org.apache.calcite.tools.RelBuilderFactory relBuilder)`

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`void`	`onMatch(org.apache.calcite.plan.RelOptRuleCall call)`

protected static final org.slf4j.Logger LOG

public static final HiveJoinConstraintsRule INSTANCE

protected HiveJoinConstraintsRule(org.apache.calcite.tools.RelBuilderFactory relBuilder)

Class HiveJoinConstraintsRule