Examples with LikeParseNode org.apache.phoenix.parse.LikeParseNode used on opensource projects

Example 1 with LikeParseNode

use of org.apache.phoenix.parse.LikeParseNode in project phoenix by apache.

the class ExpressionCompiler method visitLeave.

@Override
public Expression visitLeave(LikeParseNode node, List<Expression> children) throws SQLException {
    ParseNode lhsNode = node.getChildren().get(0);
    ParseNode rhsNode = node.getChildren().get(1);
    Expression lhs = children.get(0);
    Expression rhs = children.get(1);
    if (rhs.getDataType() != null && lhs.getDataType() != null && !lhs.getDataType().isCoercibleTo(rhs.getDataType()) && !rhs.getDataType().isCoercibleTo(lhs.getDataType())) {
        throw TypeMismatchException.newException(lhs.getDataType(), rhs.getDataType(), node.toString());
    }
    if (lhsNode instanceof BindParseNode) {
        context.getBindManager().addParamMetaData((BindParseNode) lhsNode, rhs);
    }
    if (rhsNode instanceof BindParseNode) {
        context.getBindManager().addParamMetaData((BindParseNode) rhsNode, lhs);
    }
    if (rhs instanceof LiteralExpression) {
        String pattern = (String) ((LiteralExpression) rhs).getValue();
        if (pattern == null || pattern.length() == 0) {
            return LiteralExpression.newConstant(null, rhs.getDeterminism());
        }
        // TODO: for pattern of '%' optimize to strlength(lhs) > 0
        // We can't use lhs IS NOT NULL b/c if lhs is NULL we need
        // to return NULL.
        int index = LikeExpression.indexOfWildcard(pattern);
        // Can't possibly be as long as the constant, then FALSE
        Integer lhsMaxLength = lhs.getMaxLength();
        if (lhsMaxLength != null && lhsMaxLength < index) {
            return LiteralExpression.newConstant(false, rhs.getDeterminism());
        }
        if (index == -1) {
            String rhsLiteral = LikeExpression.unescapeLike(pattern);
            if (lhsMaxLength != null && lhsMaxLength != rhsLiteral.length()) {
                return LiteralExpression.newConstant(false, rhs.getDeterminism());
            }
            if (node.getLikeType() == LikeType.CASE_SENSITIVE) {
                CompareOp op = node.isNegate() ? CompareOp.NOT_EQUAL : CompareOp.EQUAL;
                if (pattern.equals(rhsLiteral)) {
                    return new ComparisonExpression(children, op);
                } else {
                    rhs = LiteralExpression.newConstant(rhsLiteral, PChar.INSTANCE, rhs.getDeterminism());
                    return new ComparisonExpression(Arrays.asList(lhs, rhs), op);
                }
            }
        } else {
            byte[] wildcardString = new byte[pattern.length()];
            byte[] wildcard = { StringUtil.MULTI_CHAR_LIKE };
            StringUtil.fill(wildcardString, 0, pattern.length(), wildcard, 0, 1, false);
            if (pattern.equals(new String(wildcardString))) {
                List<Expression> compareChildren = Arrays.asList(lhs, NOT_NULL_STRING);
                return new ComparisonExpression(compareChildren, node.isNegate() ? CompareOp.LESS : CompareOp.GREATER_OR_EQUAL);
            }
        }
    }
    QueryServices services = context.getConnection().getQueryServices();
    boolean useByteBasedRegex = services.getProps().getBoolean(QueryServices.USE_BYTE_BASED_REGEX_ATTRIB, QueryServicesOptions.DEFAULT_USE_BYTE_BASED_REGEX);
    Expression expression;
    if (useByteBasedRegex) {
        expression = ByteBasedLikeExpression.create(children, node.getLikeType());
    } else {
        expression = StringBasedLikeExpression.create(children, node.getLikeType());
    }
    if (ExpressionUtil.isConstant(expression)) {
        ImmutableBytesWritable ptr = context.getTempPtr();
        if (!expression.evaluate(null, ptr)) {
            return LiteralExpression.newConstant(null, expression.getDeterminism());
        } else {
            return LiteralExpression.newConstant(Boolean.TRUE.equals(PBoolean.INSTANCE.toObject(ptr)) ^ node.isNegate(), expression.getDeterminism());
        }
    }
    if (node.isNegate()) {
        expression = new NotExpression(expression);
    }
    return wrapGroupByExpression(expression);
}