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module Polars
# Namespace for expressions on a meta level.
class MetaExpr
# @private
attr_accessor :_rbexpr
# @private
def initialize(expr)
self._rbexpr = expr._rbexpr
end
# Equal.
#
# @return [Boolean]
def ==(other)
_rbexpr.meta_eq(other._rbexpr)
end
# Not equal.
#
# @return [Boolean]
def !=(other)
!(self == other)
end
# Pop the latest expression and return the input(s) of the popped expression.
#
# @return [Array]
def pop
_rbexpr.meta_pop.map { |e| Utils.wrap_expr(e) }
end
# Get a list with the root column name.
#
# @return [Array]
def root_names
_rbexpr.meta_roots
end
# Get the column name that this expression would produce.
#
# @return [String]
def output_name
_rbexpr.meta_output_name
end
# Undo any renaming operation like `alias` or `keep_name`.
#
# @return [Expr]
def undo_aliases
Utils.wrap_expr(_rbexpr.meta_undo_aliases)
end
end
end
Version data entries
68 entries across 68 versions & 1 rubygems