Object startValue = filterInfo.get(this.startFilterInfoKey);
Object endValue = filterInfo.get(this.endFilterInfoKey);
if (startValue == null && endValue == null) {
return new AlwaysTrueExpression();
}
Expression columnExpr = new VariableExpression(this.columnId);
Expression startValueExpr = startValue != null ? new ValueExpression(startValue) : null;
Expression endValueExpr = endValue != null ? new ValueExpression(endValue) : null;