PushCastIntoRow (trino-main 358 API)

java.lang.Object
- io.trino.sql.planner.iterative.rule.ExpressionRewriteRuleSet
- - io.trino.sql.planner.iterative.rule.PushCastIntoRow

```
public class PushCastIntoRow
extends ExpressionRewriteRuleSet
```
Transforms expressions of the form
```
  CAST(
      CAST(
          ROW(x, y)
          AS row(f1 type1, f2 type2))
      AS row(g1 type3, g2 type4))
 
```
to
```
  CAST(
      ROW(
          CAST(x AS type1),
          CAST(y AS type2))
      AS row(g1 type3, g2 type4))
 
```
Note: it preserves the top-level CAST if the row type has field names because the names are needed by the ROW to JSON cast TODO: ideally, the types involved in ROW to JSON cast should be captured at analysis time and remain fixed for the duration of the optimization process so as to have flexibility in terms of removing field names, which are irrelevant in the IR

- Nested Class Summary
  - Nested classes/interfaces inherited from class io.trino.sql.planner.iterative.rule.ExpressionRewriteRuleSet
    ExpressionRewriteRuleSet.ExpressionRewriter
- Constructor Summary
  
  Constructors
  Constructor Description
  
  PushCastIntoRow()
- Method Summary
  - Methods inherited from class io.trino.sql.planner.iterative.rule.ExpressionRewriteRuleSet
    aggregationExpressionRewrite, filterExpressionRewrite, joinExpressionRewrite, projectExpressionRewrite, rules, valuesExpressionRewrite
  - Methods inherited from class java.lang.Object
    clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Constructor Detail
  - PushCastIntoRow
```
public PushCastIntoRow()
```