RexSimplify (Flink : Table : Planner 1.15.0 API)

java.lang.Object
- org.apache.calcite.rex.RexSimplify

```
public class RexSimplify
extends Object
```
Context required to simplify a row-expression.
Copied to fix Calcite 1.26 bugs, should be removed for the next Calcite upgrade.
Changes (line numbers are from the original RexSimplify file):
1. CALCITE-4364 & FLINK-19811: Line 1307, Line 1764, Line 2638 ~ Line 2656.
2. CALCITE-4446 & FLINK-22015: Line 2542 ~ Line 2548, Line 2614 ~ Line 2619.

字段概要

字段
限定符和类型字段和说明

org.apache.calcite.rex.RexBuilder rexBuilder

字段
限定符和类型	字段和说明
`org.apache.calcite.rex.RexBuilder`	`rexBuilder`

构造器概要

构造器
构造器和说明
`RexSimplify(org.apache.calcite.rex.RexBuilder rexBuilder, boolean unknownAsFalse, org.apache.calcite.rex.RexExecutor executor)` 已过时。
`RexSimplify(org.apache.calcite.rex.RexBuilder rexBuilder, org.apache.calcite.plan.RelOptPredicateList predicates, boolean unknownAsFalse, org.apache.calcite.rex.RexExecutor executor)` 已过时。
`RexSimplify(org.apache.calcite.rex.RexBuilder rexBuilder, org.apache.calcite.plan.RelOptPredicateList predicates, org.apache.calcite.rex.RexExecutor executor)` Creates a RexSimplify.

方法概要

所有方法实例方法具体方法已过时的方法
限定符和类型	方法和说明
`org.apache.calcite.rex.RexNode`	`removeNullabilityCast(org.apache.calcite.rex.RexNode e)` Removes any casts that change nullability but not type.
`org.apache.calcite.rex.RexNode`	`simplify(org.apache.calcite.rex.RexNode e)` Simplifies a boolean expression.
`org.apache.calcite.rex.RexNode`	`simplifyAnd(org.apache.calcite.rex.RexCall e)` 已过时。
`org.apache.calcite.rex.RexNode`	`simplifyAnds(Iterable<? extends org.apache.calcite.rex.RexNode> nodes)` 已过时。
`org.apache.calcite.rex.RexNode`	`simplifyFilterPredicates(Iterable<? extends org.apache.calcite.rex.RexNode> predicates)` Combines predicates AND, optimizes, and returns null if the result is always false.
`org.apache.calcite.rex.RexNode`	`simplifyOr(org.apache.calcite.rex.RexCall call)` 已过时。
`org.apache.calcite.rex.RexNode`	`simplifyOrs(List<org.apache.calcite.rex.RexNode> terms)` 已过时。
`org.apache.calcite.rex.RexNode`	`simplifyPreservingType(org.apache.calcite.rex.RexNode e)` Simplifies a boolean expression, always preserving its type and its nullability.
`org.apache.calcite.rex.RexNode`	`simplifyPreservingType(org.apache.calcite.rex.RexNode e, org.apache.calcite.rex.RexUnknownAs unknownAs, boolean matchNullability)`
`org.apache.calcite.rex.RexNode`	`simplifyUnknownAs(org.apache.calcite.rex.RexNode e, org.apache.calcite.rex.RexUnknownAs unknownAs)` As `simplify(RexNode)`, but specifying how UNKNOWN values are to be treated.
`org.apache.calcite.rex.RexNode`	`simplifyUnknownAsFalse(org.apache.calcite.rex.RexNode e)` As `simplify(RexNode)`, but for a boolean expression for which a result of UNKNOWN will be treated as FALSE.
`RexSimplify`	`withParanoid(boolean paranoid)` Returns a RexSimplify the same as this but which verifies that the expression before and after simplification are equivalent.
`RexSimplify`	`withPredicates(org.apache.calcite.plan.RelOptPredicateList predicates)` Returns a RexSimplify the same as this but with a specified `predicates` value.
`RexSimplify`	`withUnknownAsFalse(boolean unknownAsFalse)` 已过时。 Use methods with a `RexUnknownAs` argument, such as `simplify(RexNode, RexUnknownAs)`.

从类继承的方法 java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- 字段详细资料
  - rexBuilder
```
public final org.apache.calcite.rex.RexBuilder rexBuilder
```
- 构造器详细资料
  - RexSimplify
```
public RexSimplify(org.apache.calcite.rex.RexBuilder rexBuilder,
                   org.apache.calcite.plan.RelOptPredicateList predicates,
                   org.apache.calcite.rex.RexExecutor executor)
```
    Creates a RexSimplify.
    
    参数:
    
    rexBuilder - Rex builder
    
    predicates - Predicates known to hold on input fields
    
    executor - Executor for constant reduction, not null
  - RexSimplify
```
@Deprecated
public RexSimplify(org.apache.calcite.rex.RexBuilder rexBuilder,
                               boolean unknownAsFalse,
                               org.apache.calcite.rex.RexExecutor executor)
```
    已过时。
  - RexSimplify
```
@Deprecated
public RexSimplify(org.apache.calcite.rex.RexBuilder rexBuilder,
                               org.apache.calcite.plan.RelOptPredicateList predicates,
                               boolean unknownAsFalse,
                               org.apache.calcite.rex.RexExecutor executor)
```
    已过时。
- 方法详细资料
  - withUnknownAsFalse
```
@Deprecated
public RexSimplify withUnknownAsFalse(boolean unknownAsFalse)
```
    已过时。 Use methods with a RexUnknownAs argument, such as simplify(RexNode, RexUnknownAs).
    
    Returns a RexSimplify the same as this but with a specified defaultUnknownAs value.
  - withPredicates
```
public RexSimplify withPredicates(org.apache.calcite.plan.RelOptPredicateList predicates)
```
    Returns a RexSimplify the same as this but with a specified predicates value.
  - withParanoid
```
public RexSimplify withParanoid(boolean paranoid)
```
    Returns a RexSimplify the same as this but which verifies that the expression before and after simplification are equivalent.
    
    另请参阅:
    
    verify(org.apache.calcite.rex.RexNode, org.apache.calcite.rex.RexNode, org.apache.calcite.rex.RexUnknownAs)
  - simplifyPreservingType
```
public org.apache.calcite.rex.RexNode simplifyPreservingType(org.apache.calcite.rex.RexNode e)
```
    Simplifies a boolean expression, always preserving its type and its nullability.
    This is useful if you are simplifying expressions in a Project.
  - simplifyPreservingType
```
public org.apache.calcite.rex.RexNode simplifyPreservingType(org.apache.calcite.rex.RexNode e,
                                                             org.apache.calcite.rex.RexUnknownAs unknownAs,
                                                             boolean matchNullability)
```
  - simplify
```
public org.apache.calcite.rex.RexNode simplify(org.apache.calcite.rex.RexNode e)
```
    Simplifies a boolean expression.
    In particular:
    - simplify(x = 1 AND y = 2 AND NOT x = 1) returns y = 2
    - simplify(x = 1 AND FALSE) returns FALSE
    Handles UNKNOWN values using the policy specified when you created this RexSimplify. Unless you used a deprecated constructor, that policy is RexUnknownAs.UNKNOWN.
    If the expression is a predicate in a WHERE clause, consider instead using simplifyUnknownAsFalse(RexNode).
    参数:
    
    e - Expression to simplify
  - simplifyUnknownAsFalse
```
public final org.apache.calcite.rex.RexNode simplifyUnknownAsFalse(org.apache.calcite.rex.RexNode e)
```
    As simplify(RexNode), but for a boolean expression for which a result of UNKNOWN will be treated as FALSE.
    Use this form for expressions on a WHERE, ON, HAVING or FILTER(WHERE) clause.
    This may allow certain additional simplifications. A result of UNKNOWN may yield FALSE, however it may still yield UNKNOWN. (If the simplified expression has type BOOLEAN NOT NULL, then of course it can only return FALSE.)
  - simplifyUnknownAs
```
public org.apache.calcite.rex.RexNode simplifyUnknownAs(org.apache.calcite.rex.RexNode e,
                                                        org.apache.calcite.rex.RexUnknownAs unknownAs)
```
    As simplify(RexNode), but specifying how UNKNOWN values are to be treated.
    If UNKNOWN is treated as FALSE, this may allow certain additional simplifications. A result of UNKNOWN may yield FALSE, however it may still yield UNKNOWN. (If the simplified expression has type BOOLEAN NOT NULL, then of course it can only return FALSE.)
  - simplifyAnds
```
@Deprecated
public org.apache.calcite.rex.RexNode simplifyAnds(Iterable<? extends org.apache.calcite.rex.RexNode> nodes)
```
    已过时。
    
    Simplifies a conjunction of boolean expressions.
  - simplifyAnd
```
@Deprecated
public org.apache.calcite.rex.RexNode simplifyAnd(org.apache.calcite.rex.RexCall e)
```
    已过时。
  - simplifyOr
```
@Deprecated
public org.apache.calcite.rex.RexNode simplifyOr(org.apache.calcite.rex.RexCall call)
```
    已过时。
    
    Simplifies OR(x, x) into x, and similar. The simplified expression returns UNKNOWN values as is (not as FALSE).
  - simplifyOrs
```
@Deprecated
public org.apache.calcite.rex.RexNode simplifyOrs(List<org.apache.calcite.rex.RexNode> terms)
```
    已过时。
    
    Simplifies a list of terms and combines them into an OR. Modifies the list in place. The simplified expression returns UNKNOWN values as is (not as FALSE).
  - removeNullabilityCast
```
public org.apache.calcite.rex.RexNode removeNullabilityCast(org.apache.calcite.rex.RexNode e)
```
    Removes any casts that change nullability but not type.
    For example, CAST(1 = 0 AS BOOLEAN) becomes 1 = 0.
  - simplifyFilterPredicates
```
public org.apache.calcite.rex.RexNode simplifyFilterPredicates(Iterable<? extends org.apache.calcite.rex.RexNode> predicates)
```
    Combines predicates AND, optimizes, and returns null if the result is always false.
    The expression is simplified on the assumption that an UNKNOWN value is always treated as FALSE. Therefore the simplified expression may sometimes evaluate to FALSE where the original expression would evaluate to UNKNOWN.
    
    参数:
    
    predicates - Filter condition predicates
    
    返回:
    
    simplified conjunction of predicates for the filter, null if always false

类 RexSimplify

字段概要

构造器概要

方法概要

从类继承的方法 java.lang.Object

字段详细资料

rexBuilder

构造器详细资料

RexSimplify

RexSimplify

RexSimplify

方法详细资料

withUnknownAsFalse

withPredicates

withParanoid

simplifyPreservingType

simplifyPreservingType

simplify

simplifyUnknownAsFalse

simplifyUnknownAs

simplifyAnds

simplifyAnd

simplifyOr

simplifyOrs

removeNullabilityCast

simplifyFilterPredicates