private ASTNode createProjection()

in parser/sql/dialect/sqlserver/src/main/java/org/apache/shardingsphere/sql/parser/sqlserver/visitor/statement/SQLServerStatementVisitor.java [1500:1552]
52 lines of code
9 McCabe index (conditional complexity)

    private ASTNode createProjection(final ProjectionContext ctx, final AliasSegment alias) {
        ASTNode projection = visit(ctx.expr());
        if (projection instanceof AggregationProjectionSegment) {
            ((AggregationProjectionSegment) projection).setAlias(alias);
            return projection;
        }
        if (projection instanceof ExpressionProjectionSegment) {
            ((ExpressionProjectionSegment) projection).setAlias(alias);
            return projection;
        }
        if (projection instanceof FunctionSegment) {
            FunctionSegment segment = (FunctionSegment) projection;
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(segment.getStartIndex(), segment.getStopIndex(), segment.getText(), segment);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof CommonExpressionSegment) {
            CommonExpressionSegment segment = (CommonExpressionSegment) projection;
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(segment.getStartIndex(), segment.getStopIndex(), segment.getText(), segment);
            result.setAlias(alias);
            return result;
        }
        // FIXME :For DISTINCT()
        if (projection instanceof ColumnSegment) {
            ColumnProjectionSegment result = new ColumnProjectionSegment((ColumnSegment) projection);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof SubqueryExpressionSegment) {
            SubqueryExpressionSegment subqueryExpressionSegment = (SubqueryExpressionSegment) projection;
            String text = ctx.start.getInputStream().getText(new Interval(subqueryExpressionSegment.getStartIndex(), subqueryExpressionSegment.getStopIndex()));
            SubqueryProjectionSegment result = new SubqueryProjectionSegment(((SubqueryExpressionSegment) projection).getSubquery(), text);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof BinaryOperationExpression) {
            BinaryOperationExpression binaryExpression = (BinaryOperationExpression) projection;
            int startIndex = getStartIndexWithAlias(binaryExpression, alias);
            int stopIndex = getStopIndexWithAlias(binaryExpression, alias);
            ExpressionProjectionSegment result = new ExpressionProjectionSegment(startIndex, stopIndex, binaryExpression.getText(), binaryExpression);
            result.setAlias(alias);
            return result;
        }
        if (projection instanceof ParameterMarkerExpressionSegment) {
            ParameterMarkerExpressionSegment result = (ParameterMarkerExpressionSegment) projection;
            result.setAlias(alias);
            return projection;
        }
        ExpressionSegment column = (ExpressionSegment) projection;
        ExpressionProjectionSegment result = new ExpressionProjectionSegment(getStartIndexWithAlias(column, alias), getStopIndexWithAlias(column, alias), String.valueOf(column.getText()), column);
        result.setAlias(alias);
        return result;
    }