Examples with SqlPostfixOperator org.apache.calcite.sql.SqlPostfixOperator used on opensource projects

Example 1 with SqlPostfixOperator

use of org.apache.calcite.sql.SqlPostfixOperator in project flink by apache.

the class OverConvertRule method createBound.

private RexWindowBound createBound(ConvertContext context, Expression bound, SqlKind sqlKind) {
    if (bound instanceof CallExpression) {
        CallExpression callExpr = (CallExpression) bound;
        FunctionDefinition func = callExpr.getFunctionDefinition();
        if (BuiltInFunctionDefinitions.UNBOUNDED_ROW.equals(func) || BuiltInFunctionDefinitions.UNBOUNDED_RANGE.equals(func)) {
            SqlNode unbounded = sqlKind.equals(SqlKind.PRECEDING) ? SqlWindow.createUnboundedPreceding(SqlParserPos.ZERO) : SqlWindow.createUnboundedFollowing(SqlParserPos.ZERO);
            return RexWindowBound.create(unbounded, null);
        } else if (BuiltInFunctionDefinitions.CURRENT_ROW.equals(func) || BuiltInFunctionDefinitions.CURRENT_RANGE.equals(func)) {
            SqlNode currentRow = SqlWindow.createCurrentRow(SqlParserPos.ZERO);
            return RexWindowBound.create(currentRow, null);
        } else {
            throw new IllegalArgumentException("Unexpected expression: " + bound);
        }
    } else if (bound instanceof ValueLiteralExpression) {
        RelDataType returnType = context.getTypeFactory().createFieldTypeFromLogicalType(new DecimalType(true, 19, 0));
        SqlOperator sqlOperator = new SqlPostfixOperator(sqlKind.name(), sqlKind, 2, new OrdinalReturnTypeInference(0), null, null);
        SqlNode[] operands = new SqlNode[] { SqlLiteral.createExactNumeric("1", SqlParserPos.ZERO) };
        SqlNode node = new SqlBasicCall(sqlOperator, operands, SqlParserPos.ZERO);
        ValueLiteralExpression literalExpr = (ValueLiteralExpression) bound;
        RexNode literalRexNode = literalExpr.getValueAs(BigDecimal.class).map(v -> context.getRelBuilder().literal(v)).orElse(context.getRelBuilder().literal(extractValue(literalExpr, Object.class)));
        List<RexNode> expressions = new ArrayList<>();
        expressions.add(literalRexNode);
        RexNode rexNode = context.getRelBuilder().getRexBuilder().makeCall(returnType, sqlOperator, expressions);
        return RexWindowBound.create(node, rexNode);
    } else {
        throw new TableException("Unexpected expression: " + bound);
    }
}