Module utils

Traits

• PushNode

Functions

• aexpr_output_name
• aexpr_to_leaf_name
• aexpr_to_leaf_names
• aexpr_to_leaf_names_iter
• column_node_to_name
• comma_delimited
  Utility to write comma delimited strings
• expr_output_name
  output name of expr
• expr_to_leaf_column_name
  unpack alias(col) to name of the root column name
• expr_to_leaf_column_names
  This should gradually replace expr_to_root_column as this will get all names in the tree.
• expr_to_leaf_column_names_iter
• expressions_to_schema
  Take a list of expressions and a schema and determine the output schema.
• has_aexpr
• has_aexpr_literal
• has_aexpr_window
• has_expr
  Can check if an expression tree has a matching_expr. This requires a dummy expression to be created that will be used to pattern match against.
• has_null
• merge_schemas
  Concatenate multiple schemas into one, disallowing duplicate field names