pyarrow.dataset.field#

pyarrow.dataset.field(*name_or_index)[source]#

Reference a column of the dataset.

Stores only the field’s name. Type and other information is known only whenthe expression is bound to a dataset having an explicit scheme.

Nested references are allowed by passing multiple names or a tuple ofnames. For example('foo','bar') references the field named “bar”inside the field named “foo”.

Parameters:

*name_or_indexstr,multiplestrings,tuple orint

The name or index of the (possibly nested) field the expressionreferences to.

Returns:

field_exprExpression

Reference to the given field

Examples

>>>importpyarrow.computeaspc>>>pc.field("a")<pyarrow.compute.Expression a>>>>pc.field(1)<pyarrow.compute.Expression FieldPath(1)>>>>pc.field(("a","b"))<pyarrow.compute.Expression FieldRef.Nested(FieldRef.Name(a) ...>>>pc.field("a","b")<pyarrow.compute.Expression FieldRef.Nested(FieldRef.Name(a) ...