Module datafusion::optimizer::utils

Collection of utility functions that are leveraged by the query optimizer rules

Functions

expr_to_column_indices	Recursively walk an expression tree, collecting the unique set of column indexes referenced in the expression
expr_to_field	Create field meta-data from an expression, for use in a result set schema
exprlist_to_column_indices	Recursively walk a list of expression trees, collecting the unique set of column indexes referenced in the expression
exprlist_to_fields	Create field meta-data from an expression, for use in a result set schema
get_supertype	Given two datatypes, determine the supertype that both types can safely be cast to