Examples of org.eigenbase.rex.RexLiteral

org.eigenbase.rex.RexLiteral

Constant value in a row-expression.

There are several methods for creating literals in {@link RexBuilder}: {@link RexBuilder#makeLiteral(boolean)} and so forth.

How is the value stored? In that respect, the class is somewhat of a black box. There is a {@link #getValue} method which returns the value as anobject, but the type of that value is implementation detail, and it is best that your code does not depend upon that knowledge. It is better to use task-oriented methods such as {@link #getValue2} and{@link #toJavaString}.

The allowable types and combinations are:

Allowable types for RexLiteral instances
TypeName	Meaing	Value type
{@link SqlTypeName#NULL}	The null value. It has its own special type.	null
{@link SqlTypeName#BOOLEAN}	Boolean, namely `TRUE`, `FALSE` or `UNKNOWN`.	{@link Boolean}, or null represents the UNKNOWN value
{@link SqlTypeName#DECIMAL}	Exact number, for example `0`, `-.5`, `12345`.	{@link BigDecimal}
{@link SqlTypeName#DOUBLE}	Approximate number, for example `6.023E-23`.	{@link BigDecimal}
{@link SqlTypeName#DATE}	Date, for example `DATE '1969-04'29'`	{@link Calendar}
{@link SqlTypeName#TIME}	Time, for example `TIME '18:37:42.567'`	{@link Calendar}
{@link SqlTypeName#TIMESTAMP}	Timestamp, for example `TIMESTAMP '1969-04-29 18:37:42.567'`	{@link Calendar}
{@link SqlTypeName#CHAR}	Character constant, for example `'Hello, world!'`, `''`, `_N'Bonjour'`, `_ISO-8859-1'It''s superman!' COLLATE SHIFT_JIS$ja_JP$2`. These are always CHAR, never VARCHAR.	{@link NlsString}
{@link SqlTypeName#BINARY}	Binary constant, for example `X'7F34'`. (The number of hexits must be even; see above.) These constants are always BINARY, never VARBINARY.	{@link ByteBuffer}
{@link SqlTypeName#SYMBOL}	A symbol is a special type used to make parsing easier; it is not part of the SQL standard, and is not exposed to end-users. It is used to hold a flag, such as the LEADING flag in a call to the function `TRIM([LEADING\|TRAILING\|BOTH] chars FROM string)`.	An enum class

          logger.debug("Ignoring cast {}, {}", call.getOperands().get(0), call.getOperands().get(0).getClass());
          return call.getOperands().get(0).accept(this);
        }
        if (call.getOperator() == SqlStdOperatorTable.itemOp) {
          final RexNode left = call.getOperands().get(0);
          final RexLiteral literal = (RexLiteral) call.getOperands().get(1);
          final String field = (String) literal.getValue2();
//          buf.append('\'');
          final int length = buf.length();
          left.accept(this);
          if (buf.length() > length) {
            // check before generating empty LHS if inputName is null

View Full Code Here

          return elseExpression;
        }


        if (call.getOperator() == SqlStdOperatorTable.ITEM) {
          SchemaPath left = (SchemaPath) call.getOperands().get(0).accept(this);
          final RexLiteral literal = (RexLiteral) call.getOperands().get(1);
          switch(literal.getTypeName()){
          case DECIMAL:
          case INTEGER:
            return left.getChild(((BigDecimal)literal.getValue()).intValue());
          case CHAR:
            return left.getChild(literal.getValue2().toString());
          default:
            // fall through
          }
        }

View Full Code Here

     * 6. Project
     */
    ASTBuilder b = ASTBuilder.construct(HiveParser.TOK_SELECT, "TOK_SELECT");


    if (select.getChildExps().isEmpty()) {
      RexLiteral r = select.getCluster().getRexBuilder().makeExactLiteral(new BigDecimal(1));
      ASTNode selectExpr = ASTBuilder.selectExpr(ASTBuilder.literal(r), "1");
      b.add(selectExpr);
    } else {
      int i = 0;


      for (RexNode r : select.getChildExps()) {
        ASTNode selectExpr = ASTBuilder.selectExpr(r.accept(
             new RexVisitor(schema, r instanceof RexLiteral)),
                  select.getRowType().getFieldNames().get(i++));
        b.add(selectExpr);
      }
    }

View Full Code Here


    final RexNode denominator;
    if (biased) {
      denominator = countArg;
    } else {
      final RexLiteral one =
          rexBuilder.makeExactLiteral(BigDecimal.ONE);
      final RexNode nul =
          rexBuilder.makeNullLiteral(countArg.getType().getSqlTypeName());
      final RexNode countMinusOne =
          rexBuilder.makeCall(

View Full Code Here


          // Convert expr of item[*, 'abc'] into column expression 'abc'
          String rootSegName = left.getRootSegment().getPath();
          if (StarColumnHelper.isStarColumn(rootSegName)) {
            rootSegName = rootSegName.substring(0, rootSegName.indexOf("*"));
            final RexLiteral literal = (RexLiteral) call.getOperands().get(1);
            return SchemaPath.getSimplePath(rootSegName + literal.getValue2().toString());
          }


          final RexLiteral literal = (RexLiteral) call.getOperands().get(1);
          switch(literal.getTypeName()){
          case DECIMAL:
          case INTEGER:
            return left.getChild(((BigDecimal)literal.getValue()).intValue());
          case CHAR:
            return left.getChild(literal.getValue2().toString());
          default:
            // fall through
          }
        }

View Full Code Here


  public void run() throws InterruptedException {
    for (List<RexLiteral> list : rel.getTuples()) {
      final Object[] values = new Object[fieldCount];
      for (int i = 0; i < list.size(); i++) {
        RexLiteral rexLiteral = list.get(i);
        values[i] = rexLiteral.getValue();
      }
      sink.send(new Row(values));
    }
    sink.end();
  }

View Full Code Here


    final RexNode denominator;
    if (biased) {
      denominator = countArg;
    } else {
      final RexLiteral one =
          rexBuilder.makeExactLiteral(BigDecimal.ONE);
      final RexNode nul =
          rexBuilder.makeNullLiteral(countArg.getType().getSqlTypeName());
      final RexNode countMinusOne =
          rexBuilder.makeCall(

View Full Code Here


          // Convert expr of item[*, 'abc'] into column expression 'abc'
          String rootSegName = left.getRootSegment().getPath();
          if (StarColumnHelper.isStarColumn(rootSegName)) {
            rootSegName = rootSegName.substring(0, rootSegName.indexOf("*"));
            final RexLiteral literal = (RexLiteral) call.getOperands().get(1);
            return SchemaPath.getSimplePath(rootSegName + literal.getValue2().toString());
          }


          final RexLiteral literal = (RexLiteral) call.getOperands().get(1);
          switch(literal.getTypeName()){
          case DECIMAL:
          case INTEGER:
            return left.getChild(((BigDecimal)literal.getValue()).intValue());
          case CHAR:
            return left.getChild(literal.getValue2().toString());
          default:
            // fall through
          }
        }

View Full Code Here

    {
    Tuple tuple = Tuple.size( values.size() );


    for( int i = 0; i < values.size(); i++ )
      {
      RexLiteral rexLiteral = values.get( i );


      Object value = null;
      String result;


      // this overcomes an inconsistency in getValue2 with regard to date and time being
      // canonically integers, but getValue2 returning long values.
      // should be resolved in a future optiq release.
      switch( rexLiteral.getType().getSqlTypeName() )
        {
        case DATE:
          result = rexLiteral.toString();


          if( !result.equals( "null" ) ) // workaround till first class support in optiq
            value = SQL_DATE_COERCIBLE_TYPE.canonical( result );


          break;
        case TIME:
          result = rexLiteral.toString();


          if( !result.equals( "null" ) ) // workaround till first class support in optiq
            value = SQL_TIME_COERCIBLE_TYPE.canonical( value );


          break;
        default:
          value = rexLiteral.getValue2();
          break;
        }


      tuple.set( i, value );
      }

View Full Code Here

TOP

Related Classes of org.eigenbase.rex.RexLiteral

cascading.lingual.optiq.enumerable.EnumerableUtil

net.hydromatic.avatica.ByteString

net.hydromatic.optiq.impl.interpreter.ValuesNode

org.apache.drill.exec.planner.logical.DrillOptiq$RexToDrill

org.apache.drill.exec.planner.logical.DrillReduceAggregatesRule

org.apache.drill.optiq.DrillOptiq$RexToDrill

org.apache.hadoop.hive.ql.optimizer.optiq.translator.ASTConverter

All source code are property of their respective owners. Java is a trademark of Sun Microsystems, Inc and owned by ORACLE Inc. Contact coftware#gmail.com.