Package sql.util

Examples of sql.util.JoinTablesExprs


  }

  private IndexCompGen generateTableJoins() {
    final List<Table> tableList = _pq.getTableList();
    final TableSelector ts = new TableSelector(tableList, _schema, _pq.getTan());
    final JoinTablesExprs jte = _pq.getJte();

    final IndexCompGen cg = new IndexCompGen(_schema, _pq, _map);

    // first phase
    // make high level pairs
    final List<String> skippedBestTableNames = new ArrayList<String>();
    final int numTables = tableList.size();
    if (numTables == 1) {
      cg.generateDataSource(ParserUtil.getComponentName(tableList.get(0)));
      return cg;
    } else {
      final int highLevelPairs = getNumHighLevelPairs(numTables);

      for (int i = 0; i < highLevelPairs; i++) {
        final String bestTableName = ts.removeBestTableName();

        // enumerates all the tables it has joinCondition to join with
        final List<String> joinedWith = jte.getJoinedWith(bestTableName);
        // dependent on previously used tables, so might return null
        final String bestPairedTable = ts.removeBestPairedTableName(joinedWith);
        if (bestPairedTable != null) {
          // we found a pair
          final DataSourceComponent bestSource = cg.generateDataSource(bestTableName);
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