Useful Language-Specific Features

1. Accessing Object Properties - When a column is of a composite type, you can use the query syntax ColumnName.SomeProperty to obtain the value of SomeProperty from the ColumnName object. The type of ColumnName must include the SomeProperty. If it has the appropriate property, the column becomes the type that SomeProperty is. You can use the chaining call syntax like ColumnName.SomeProperty.DifferentProperty. It is also permissible to obtain values from arrays using the syntax ColumnName.Prop[0] as well as obtaining values from dictionaries with ColumnName.Prop['test'].
2. Like / not like Operators - These operators can be used to search for specific patterns in a query. Both the % and _ syntax are supported to find values matching the pattern.
3. Rlike / not rlike Operators - This is the same operator as like, but instead of using a wildcard symbol, here we specify a regular expression.
4. Contains Operator - this operator checks whether the column contains a given string of characters.
5. In Operator - this operator is useful when you need to access a column, and multiple values are considered valid. The expression looks like this: ColumnName in ('abc', 'cda')
6. Is null / is not null Operators - This operator is used to check whether a column is empty. You can use it for both values and columns expressed by reference. It should be noted that using it for values does not make sense and in fact, the evaluator will discard such a check. Usage looks like ColumnName is null or ColumnName is not null