protected RelDataType validateImpl() {
   final RelDataTypeFactory.FieldInfoBuilder builder = validator.getTypeFactory().builder();
   for (SqlMoniker moniker : validator.catalogReader.getAllSchemaObjectNames(names)) {
     final List<String> names1 = moniker.getFullyQualifiedNames();
     final SqlValidatorTable table = validator.catalogReader.getTable(names1);
     builder.add(Util.last(names1), table.getRowType());
   }
   return builder.build();
 }
Esempio n. 2
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  /**
   * Derives an alias for a node, and invents a mangled identifier if it cannot.
   *
   * <p>Examples:
   *
   * <ul>
   *   <li>Alias: "1 + 2 as foo" yields "foo"
   *   <li>Identifier: "foo.bar.baz" yields "baz"
   *   <li>Anything else yields "expr$<i>ordinal</i>"
   * </ul>
   *
   * @return An alias, if one can be derived; or a synthetic alias "expr$<i>ordinal</i>" if ordinal
   *     &lt; 0; otherwise null
   */
  public static String getAlias(SqlNode node, int ordinal) {
    switch (node.getKind()) {
      case AS:
        // E.g. "1 + 2 as foo" --> "foo"
        return ((SqlCall) node).operand(1).toString();

      case OVER:
        // E.g. "bids over w" --> "bids"
        return getAlias(((SqlCall) node).operand(0), ordinal);

      case IDENTIFIER:
        // E.g. "foo.bar" --> "bar"
        return Util.last(((SqlIdentifier) node).names);

      default:
        if (ordinal < 0) {
          return null;
        } else {
          return SqlUtil.deriveAliasFromOrdinal(ordinal);
        }
    }
  }