Method castChild

fe/src/main/java/org/apache/impala/analysis/Expr.java:1661–1665

Add a cast expression above child. If child is a literal expression, we attempt to convert the value of the child directly, and not insert a cast node. @param targetType type to be cast to @param childIndex index of child to be cast

(Type targetType, int childIndex)

   *          index of child to be cast
   */
  public void castChild(Type targetType, int childIndex) throws AnalysisException {
    Expr child = getChild(childIndex);
    Expr newChild = child.castTo(targetType);
    setChild(childIndex, newChild);
  }

  /**
   * Convert child to to targetType, possibly by inserting an implicit cast, or by