org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander Class Reference

Inheritance diagram for org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander:

Collaboration diagram for org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander:

Public Member Functions
SqlNode	go ()
SqlNode	visit (SqlLiteral literal)
SqlNode	visit (SqlIdentifier id)

Protected Member Functions
SqlNode	visitScoped (SqlCall call)

Package Functions
	OrderExpressionExpander (SqlSelect select, SqlNode root)

Private Member Functions
SqlNode	nthSelectItem (int ordinal, final SqlParserPos pos)

Private Attributes
final List< String >	aliasList
final SqlSelect	select
final SqlNode	root

Detailed Description

Shuttle which walks over an expression in the ORDER BY clause, replacing usages of aliases with the underlying expression.

Definition at line 5993 of file SqlValidatorImpl.java.

Constructor & Destructor Documentation

org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.OrderExpressionExpander ( SqlSelect  select, SqlNode  root  )

inlinepackage

Definition at line 5998 of file SqlValidatorImpl.java.

References org.apache.calcite.sql.validate.SqlValidatorImpl.getNamespace(), org.apache.calcite.sql.validate.SqlValidatorImpl.getOrderScope(), org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.root, and org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.select.

                                                            {
      super(getOrderScope(select));
      this.select = select;
      this.root = root;
      this.aliasList = getNamespace(select).getRowType().getFieldNames();
    }

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Member Function Documentation

SqlNode org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.go ( )

inline

Definition at line 6005 of file SqlValidatorImpl.java.

                        {
      return root.accept(this);
    }

SqlNode org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.nthSelectItem ( int  ordinal, final SqlParserPos  pos  )

inlineprivate

Returns the ordinalth item in the select list.

Definition at line 6038 of file SqlValidatorImpl.java.

References org.apache.calcite.sql.validate.SqlValidatorImpl.expandStar(), and org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.select.

Referenced by org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visit().

                                                                       {
      // TODO: Don't expand the list every time. Maybe keep an expanded
      // version of each expression -- select lists and identifiers -- in
      // the validator.

      SqlNodeList expandedSelectList =
          expandStar(
              select.getSelectList(),
              select,
              false);
      SqlNode expr = expandedSelectList.get(ordinal);
      expr = stripAs(expr);
      if (expr instanceof SqlIdentifier) {
        expr = getScope().fullyQualify((SqlIdentifier) expr).identifier;
      }

      // Create a copy of the expression with the position of the order
      // item.
      return expr.clone(pos);
    }

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SqlNode org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visit ( SqlLiteral  literal )

inline

Definition at line 6009 of file SqlValidatorImpl.java.

References org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.aliasList, org.apache.calcite.sql.validate.SqlValidatorImpl.config(), org.apache.calcite.sql.validate.SqlValidatorImpl.newValidationError(), org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.nthSelectItem(), and org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.root.

                                             {
      // Ordinal markers, e.g. 'select a, b from t order by 2'.
      // Only recognize them if they are the whole expression,
      // and if the dialect permits.
      if (literal == root && config.sqlConformance().isSortByOrdinal()) {
        switch (literal.getTypeName()) {
        case DECIMAL:
        case DOUBLE:
          final int intValue = literal.intValue(false);
          if (intValue >= 0) {
            if (intValue < 1 || intValue > aliasList.size()) {
              throw newValidationError(
                  literal, RESOURCE.orderByOrdinalOutOfRange());
            }

            // SQL ordinals are 1-based, but Sort's are 0-based
            int ordinal = intValue - 1;
            return nthSelectItem(ordinal, literal.getParserPosition());
          }
          break;
        }
      }

      return super.visit(literal);
    }

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SqlNode org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visit ( SqlIdentifier  id )

inline

Definition at line 6059 of file SqlValidatorImpl.java.

References org.apache.calcite.sql.validate.SqlValidatorImpl.alias(), org.apache.calcite.sql.validate.SqlValidatorImpl.config(), field(), org.apache.calcite.sql.validate.SqlValidatorImpl.getNamespace(), org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.nthSelectItem(), and org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.select.

                                           {
      // Aliases, e.g. 'select a as x, b from t order by x'.
      if (id.isSimple()
          && config.sqlConformance().isSortByAlias()) {
        String alias = id.getSimple();
        final SqlValidatorNamespace selectNs = getNamespace(select);
        final RelDataType rowType =
            selectNs.getRowTypeSansSystemColumns();
        final SqlNameMatcher nameMatcher = catalogReader.nameMatcher();
        RelDataTypeField field = nameMatcher.field(rowType, alias);
        if (field != null) {
          return nthSelectItem(
              field.getIndex(),
              id.getParserPosition());
        }
      }

      // No match. Return identifier unchanged.
      return getScope().fullyQualify(id).identifier;
    }

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SqlNode org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visitScoped ( SqlCall  call )

inlineprotected

Definition at line 6080 of file SqlValidatorImpl.java.

                                                {
      // Don't attempt to expand sub-queries. We haven't implemented
      // these yet.
      if (call instanceof SqlSelect) {
        return call;
      }
      return super.visitScoped(call);
    }

Member Data Documentation

final List<String> org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.aliasList

private

Definition at line 5994 of file SqlValidatorImpl.java.

Referenced by org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visit().

final SqlNode org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.root

private

Definition at line 5996 of file SqlValidatorImpl.java.

Referenced by org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.OrderExpressionExpander(), and org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visit().

final SqlSelect org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.select

private

Definition at line 5995 of file SqlValidatorImpl.java.

Referenced by org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.nthSelectItem(), org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.OrderExpressionExpander(), and org.apache.calcite.sql.validate.SqlValidatorImpl.OrderExpressionExpander.visit().

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The documentation for this class was generated from the following file:

• /home/jenkins-slave/workspace/core-os-doxygen/java/calcite/src/main/java/org/apache/calcite/sql/validate/SqlValidatorImpl.java