コード例 #1
0
 /**
  * @param expr
  * @param tables
  */
 void getTablesForExpression(AbstractExpression expr, HashSet<Table> tables) {
   List<TupleValueExpression> tves = ExpressionUtil.getTupleValueExpressions(expr);
   for (TupleValueExpression tupleExpr : tves) {
     String tableName = tupleExpr.getTableName();
     Table table = getTableFromDB(tableName);
     tables.add(table);
   }
 }
コード例 #2
0
 // Even though this function applies generally to expressions and tables and not just to TVEs as
 // such,
 // this function is somewhat TVE-related because TVEs DO represent the points where expression
 // trees
 // depend on tables.
 public static boolean isOperandDependentOnTable(AbstractExpression expr, Table table) {
   for (TupleValueExpression tve : ExpressionUtil.getTupleValueExpressions(expr)) {
     // TODO: This clumsy testing of table names regardless of table aliases is
     // EXACTLY why we can't have nice things like self-joins.
     if (table.getTypeName().equals(tve.getTableName())) {
       return true;
     }
   }
   return false;
 }
コード例 #3
0
  /**
   * Parse the scan_columns element out of the HSQL-generated XML. Fills scanColumns with a list of
   * the columns used in the plan, hashed by table name.
   *
   * @param columnsNode
   */
  void parseScanColumns(VoltXMLElement columnsNode) {
    scanColumns = new HashMap<String, ArrayList<SchemaColumn>>();

    for (VoltXMLElement child : columnsNode.children) {
      assert (child.name.equals("columnref"));
      AbstractExpression col_exp = parseExpressionTree(child);
      // TupleValueExpressions are always specifically typed,
      // so there is no need for expression type specialization, here.
      assert (col_exp != null);
      assert (col_exp instanceof TupleValueExpression);
      TupleValueExpression tve = (TupleValueExpression) col_exp;
      SchemaColumn col =
          new SchemaColumn(tve.getTableName(), tve.getColumnName(), tve.getColumnAlias(), col_exp);
      ArrayList<SchemaColumn> table_cols = null;
      if (!scanColumns.containsKey(col.getTableName())) {
        table_cols = new ArrayList<SchemaColumn>();
        scanColumns.put(col.getTableName(), table_cols);
      }
      table_cols = scanColumns.get(col.getTableName());
      table_cols.add(col);
    }
  }