Exemplo n.º 1
0
  @Override
  public void rewriteContext(CubeQueryContext cubeql) throws LensException {
    Map<String, String> colToTableAlias = cubeql.getColToTableAlias();

    extractTabAliasForCol(cubeql);
    findDimAttributesAndMeasures(cubeql);

    if (colToTableAlias.isEmpty()) {
      return;
    }

    // Rewrite the all the columns in the query with table alias prefixed.
    // If col1 of table tab1 is accessed, it would be changed as tab1.col1.
    // If tab1 is already aliased say with t1, col1 is changed as t1.col1
    // replace the columns in select, groupby, having, orderby by
    // prepending the table alias to the col
    // sample select trees
    // 1: (TOK_SELECT (TOK_SELEXPR (TOK_TABLE_OR_COL key))
    // (TOK_SELEXPR (TOK_FUNCTION count (TOK_TABLE_OR_COL value))))
    // 2: (TOK_SELECT (TOK_SELEXPR (. (TOK_TABLE_OR_COL src) key))
    // (TOK_SELEXPR (TOK_FUNCTION count (. (TOK_TABLE_OR_COL src) value))))
    // 3: (TOK_SELECT (TOK_SELEXPR (. (TOK_TABLE_OR_COL src) key) srckey))))
    replaceAliases(cubeql.getSelectAST(), 0, colToTableAlias);

    replaceAliases(cubeql.getHavingAST(), 0, colToTableAlias);

    replaceAliases(cubeql.getOrderByAST(), 0, colToTableAlias);

    replaceAliases(cubeql.getGroupByAST(), 0, colToTableAlias);

    replaceAliases(cubeql.getWhereAST(), 0, colToTableAlias);

    replaceAliases(cubeql.getJoinAST(), 0, colToTableAlias);

    // Update the aggregate expression set
    AggregateResolver.updateAggregates(cubeql.getSelectAST(), cubeql);
    AggregateResolver.updateAggregates(cubeql.getHavingAST(), cubeql);
    // Update alias map as well
    updateAliasMap(cubeql.getSelectAST(), cubeql);
  }
 public void replaceAliasInAST(CubeQueryContext cubeql) throws SemanticException {
   AliasReplacer.extractTabAliasForCol(cubeql, this);
   AliasReplacer.replaceAliases(finalAST, 0, cubeql.getColToTableAlias());
 }
Exemplo n.º 3
0
 private void extractTabAliasForCol(CubeQueryContext cubeql) throws LensException {
   extractTabAliasForCol(cubeql, cubeql);
 }