Package org.apache.drill.exec.planner.sql.parser

Examples of org.apache.drill.exec.planner.sql.parser.SqlShowSchemas


  public ShowSchemasHandler(Planner planner, QueryContext context) { super(planner, context); }

  /** Rewrite the parse tree as SELECT ... FROM INFORMATION_SCHEMA.SCHEMATA ... */
  @Override
  public SqlNode rewrite(SqlNode sqlNode) throws RelConversionException{
    SqlShowSchemas node = unwrap(sqlNode, SqlShowSchemas.class);
    List<SqlNode> selectList = ImmutableList.of((SqlNode) new SqlIdentifier("SCHEMA_NAME", SqlParserPos.ZERO));

    SqlNode fromClause = new SqlIdentifier(
        ImmutableList.of("INFORMATION_SCHEMA", "SCHEMATA"), null, SqlParserPos.ZERO, null);

    SqlNode where = null;
    final SqlNode likePattern = node.getLikePattern();
    if (likePattern != null) {
      where = DrillParserUtil.createCondition(new SqlIdentifier("SCHEMA_NAME", SqlParserPos.ZERO),
          SqlStdOperatorTable.LIKE, likePattern);
    } else if (node.getWhereClause() != null) {
      where = node.getWhereClause();
    }

    return new SqlSelect(SqlParserPos.ZERO, null, new SqlNodeList(selectList, SqlParserPos.ZERO),
        fromClause, where, null, null, null, null, null, null);
  }
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  public ShowSchemasHandler(SqlHandlerConfig config) { super(config); }

  /** Rewrite the parse tree as SELECT ... FROM INFORMATION_SCHEMA.SCHEMATA ... */
  @Override
  public SqlNode rewrite(SqlNode sqlNode) throws RelConversionException{
    SqlShowSchemas node = unwrap(sqlNode, SqlShowSchemas.class);
    List<SqlNode> selectList = ImmutableList.of((SqlNode) new SqlIdentifier("SCHEMA_NAME", SqlParserPos.ZERO));

    SqlNode fromClause = new SqlIdentifier(
        ImmutableList.of("INFORMATION_SCHEMA", "SCHEMATA"), null, SqlParserPos.ZERO, null);

    SqlNode where = null;
    final SqlNode likePattern = node.getLikePattern();
    if (likePattern != null) {
      where = DrillParserUtil.createCondition(new SqlIdentifier("SCHEMA_NAME", SqlParserPos.ZERO),
          SqlStdOperatorTable.LIKE, likePattern);
    } else if (node.getWhereClause() != null) {
      where = node.getWhereClause();
    }

    return new SqlSelect(SqlParserPos.ZERO, null, new SqlNodeList(selectList, SqlParserPos.ZERO),
        fromClause, where, null, null, null, null, null, null);
  }
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