Examples with LiteralExpression org.apache.phoenix.expression.LiteralExpression used on opensource projects

Example 1 with LiteralExpression

use of org.apache.phoenix.expression.LiteralExpression in project phoenix by apache.

the class ExpressionCompiler method visitLeave.

private Expression visitLeave(ArithmeticParseNode node, List<Expression> children, ArithmeticExpressionBinder binder, ArithmeticExpressionFactory factory) throws SQLException {
    boolean isNull = false;
    for (Expression child : children) {
        boolean isChildLiteral = (child instanceof LiteralExpression);
        isNull |= isChildLiteral && ((LiteralExpression) child).getValue() == null;
    }
    Expression expression = factory.create(node, children);
    for (int i = 0; i < node.getChildren().size(); i++) {
        ParseNode childNode = node.getChildren().get(i);
        if (childNode instanceof BindParseNode) {
            context.getBindManager().addParamMetaData((BindParseNode) childNode, binder == null ? expression : binder.getBindMetaData(i, children, expression));
        }
    }
    ImmutableBytesWritable ptr = context.getTempPtr();
    // If all children are literals, just evaluate now
    if (ExpressionUtil.isConstant(expression)) {
        return ExpressionUtil.getConstantExpression(expression, ptr);
    } else if (isNull) {
        return LiteralExpression.newConstant(null, expression.getDataType(), expression.getDeterminism());
    }
    // Otherwise create and return the expression
    return wrapGroupByExpression(expression);
}

Example 2 with LiteralExpression

use of org.apache.phoenix.expression.LiteralExpression in project phoenix by apache.

the class CeilTimestampExpression method create.

public static Expression create(List<Expression> children) throws SQLException {
    Expression firstChild = children.get(0);
    PDataType firstChildDataType = firstChild.getDataType();
    String timeUnit = (String) ((LiteralExpression) children.get(1)).getValue();
    if (TimeUnit.MILLISECOND.toString().equalsIgnoreCase(timeUnit)) {
        return new CeilTimestampExpression(children);
    }
    // Coerce TIMESTAMP to DATE, as the nanos has no affect
    List<Expression> newChildren = Lists.newArrayListWithExpectedSize(children.size());
    newChildren.add(CoerceExpression.create(firstChild, firstChildDataType == PTimestamp.INSTANCE ? PDate.INSTANCE : PUnsignedDate.INSTANCE));
    newChildren.addAll(children.subList(1, children.size()));
    return CeilDateExpression.create(newChildren);
}

Example 3 with LiteralExpression

use of org.apache.phoenix.expression.LiteralExpression in project phoenix by apache.

the class RoundTimestampExpression method create.

public static Expression create(List<Expression> children) throws SQLException {
    Expression firstChild = children.get(0);
    PDataType firstChildDataType = firstChild.getDataType();
    String timeUnit = (String) ((LiteralExpression) children.get(1)).getValue();
    LiteralExpression multiplierExpr = (LiteralExpression) children.get(2);
    /*
         * When rounding off timestamp to milliseconds, nanos play a part only when the multiplier value
         * is equal to 1. This is because for cases when multiplier value is greater than 1, number of nanos/multiplier
         * will always be less than half the nanos in a millisecond. 
         */
    if ((timeUnit == null || TimeUnit.MILLISECOND.toString().equalsIgnoreCase(timeUnit)) && ((Number) multiplierExpr.getValue()).intValue() == 1) {
        return new RoundTimestampExpression(children);
    }
    // Coerce TIMESTAMP to DATE, as the nanos has no affect
    List<Expression> newChildren = Lists.newArrayListWithExpectedSize(children.size());
    newChildren.add(CoerceExpression.create(firstChild, firstChildDataType == PTimestamp.INSTANCE ? PDate.INSTANCE : PUnsignedDate.INSTANCE));
    newChildren.addAll(children.subList(1, children.size()));
    return RoundDateExpression.create(newChildren);
}

Example 4 with LiteralExpression

use of org.apache.phoenix.expression.LiteralExpression in project phoenix by apache.

the class NthValueFunction method newServerAggregator.

@Override
public Aggregator newServerAggregator(Configuration conf) {
    FirstLastValueServerAggregator aggregator = new FirstLastValueServerAggregator();
    offset = ((Number) ((LiteralExpression) children.get(3)).getValue()).intValue();
    boolean order = (Boolean) ((LiteralExpression) children.get(1)).getValue();
    aggregator.init(children, order, offset);
    return aggregator;
}

Example 5 with LiteralExpression

use of org.apache.phoenix.expression.LiteralExpression in project phoenix by apache.

the class SubstrFunction method preservesOrder.

@Override
public OrderPreserving preservesOrder() {
    if (isOffsetConstant) {
        LiteralExpression literal = (LiteralExpression) getOffsetExpression();
        Number offsetNumber = (Number) literal.getValue();
        if (offsetNumber != null) {
            int offset = offsetNumber.intValue();
            if ((offset == 0 || offset == 1) && (!hasLengthExpression || isLengthConstant)) {
                return OrderPreserving.YES_IF_LAST;
            }
        }
    }
    return OrderPreserving.NO;
}