private RelOptTableImpl getTableFrom(List<String> names, List<String> schemaNames) {
   OptiqSchema schema = getSchema(Iterables.concat(schemaNames, Util.skipLast(names)));
   if (schema == null) {
     return null;
   }
   final String name = Util.last(names);
   Pair<String, Table> pair = schema.getTable(name, caseSensitive);
   if (pair == null) {
     pair = schema.getTableBasedOnNullaryFunction(name, caseSensitive);
   }
   if (pair != null) {
     final Table table = pair.getValue();
     final String name2 = pair.getKey();
     return RelOptTableImpl.create(this, table.getRowType(typeFactory), schema.add(name2, table));
   }
   return null;
 }
Beispiel #2
0
  /**
   * 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
   *     >= 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).getOperands()[1].toString();

      case OVER:
        // E.g. "bids over w" --> "bids"
        return getAlias(((SqlCall) node).getOperands()[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);
        }
    }
  }
 private Collection<Function> getFunctionsFrom(List<String> names) {
   final List<Function> functions2 = Lists.newArrayList();
   final List<? extends List<String>> schemaNameList;
   if (names.size() > 1) {
     // If name is qualified, ignore path.
     schemaNameList = ImmutableList.of(ImmutableList.<String>of());
   } else {
     OptiqSchema schema = getSchema(defaultSchema);
     if (schema == null) {
       schemaNameList = ImmutableList.of();
     } else {
       schemaNameList = schema.getPath();
     }
   }
   for (List<String> schemaNames : schemaNameList) {
     OptiqSchema schema = getSchema(Iterables.concat(schemaNames, Util.skipLast(names)));
     if (schema != null) {
       final String name = Util.last(names);
       functions2.addAll(schema.getFunctions(name, true));
     }
   }
   return functions2;
 }