Expressions API

Expressions provide a way to specify column-based operations on datasets. Use col() to reference columns and lit() to create literal values. These can be combined with operators to create complex expressions for filtering, transformations, and computations.

Public API

col	Reference an existing column by name.
lit	Create a literal expression from a constant value.

Expression Classes

These classes represent the structure of expressions. You typically don’t need to instantiate them directly, but you may encounter them when working with expressions.

Expr	Base class for all expression nodes.
ColumnExpr	Expression that references a column by name.
LiteralExpr	Expression that represents a constant scalar value.
BinaryExpr	Expression that represents a binary operation between two expressions.