Method stripAs

core/src/main/java/org/apache/calcite/sql/SqlUtil.java:1078–1083

If a node is "AS", returns the underlying expression; otherwise returns the node. Returns null if and only if the node is null.

(@PolyNull SqlNode node)

  /** If a node is "AS", returns the underlying expression; otherwise returns
   * the node. Returns null if and only if the node is null. */
  public static @PolyNull SqlNode stripAs(@PolyNull SqlNode node) {
    if (node != null && node.getKind() == SqlKind.AS) {
      return ((SqlCall) node).operand(0);
    }
    return node;
  }

  /** Modifies a list of nodes, removing AS from each if present.
   *