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-# Expressions
-
-Every AST node in SQLGlot is represented by a subclass of `Expression`. Each such expression encapsulates any necessary context, such as its child expressions, their names, or arg keys, and whether each child expression is optional or not.
-
-Furthermore, the following attributes are common across all expressions:
-
-#### key
-
-A unique key for each class in the `Expression` hierarchy. This is useful for hashing and representing expressions as strings.
-
-#### args
-
-A dictionary used for mapping child arg keys, to the corresponding expressions. A value in this mapping is usually either a single or a list of `Expression` instances, but SQLGlot doesn't impose any constraints on the actual type of the value.
-
-#### arg_types
-
-A dictionary used for mapping arg keys to booleans that determine whether the corresponding expressions are optional or not. Consider the following example:
-
-```python
-class Limit(Expression):
-    arg_types = {"this": False, "expression": True}
-
-```
-
-Here, `Limit` declares that it expects to have one optional and one required child expression, which can be referenced through `this` and `expression`, respectively. The arg keys are generally arbitrary, but there are helper methods for keys like `this`, `expression` and `expressions` that abstract away dictionary lookups and related checks. For this reason, these keys are common throughout SQLGlot's codebase.
-
-#### parent
-
-A reference to the parent expression (may be `None`).
-
-#### arg_key
-
-The arg key an expression is associated with, i.e. the name its parent expression uses to refer to it.
-
-#### comments
-
-A list of comments that are associated with a given expression. This is used in order to preserve comments when transpiling SQL code.
-
-#### type
-
-The data type of an expression, as inferred by SQLGlot's optimizer.