Module ast_transforms 

AST transform helpers and convenience getters.

This module provides functions for common AST mutations (adding WHERE clauses, setting LIMIT/OFFSET, renaming columns/tables) and read-only extraction helpers (getting column names, table names, functions, etc.).

Mutation functions take an owned Expression and return a new Expression. Read-only getters take &Expression.

Functions

add_select_columns

Append columns to the SELECT list of a query.

add_where

Add a condition to the WHERE clause.

get_aggregate_functions

Collect all aggregate function nodes in the expression tree.

get_column_names

Collect all column names (as String) referenced in the expression tree.

get_functions

Collect all function call nodes in the expression tree.

get_identifiers

Collect all identifier references in the expression tree.

get_literals

Collect all literal value nodes in the expression tree.

get_subqueries

Collect all subquery nodes in the expression tree.

get_table_names

Collect all table names (as String) referenced in the expression tree.

get_window_functions

Collect all window function nodes in the expression tree.

node_count

Count the total number of AST nodes in the expression tree.

qualify_columns

Qualify all unqualified column references with the given table_name.

remove_limit_offset

Remove both LIMIT and OFFSET from a SELECT.

remove_nodes

Remove (replace with a Null) all nodes matching predicate.

remove_select_columns

Remove columns from the SELECT list where predicate returns true.

remove_where

Remove the WHERE clause from a SELECT.

rename_columns

Rename columns throughout the expression tree using the provided mapping.

rename_tables

Rename tables throughout the expression tree using the provided mapping.

replace_by_type

Replace nodes matching predicate by applying replacer to the matched node.

replace_nodes

Replace nodes matching predicate with replacement (cloned for each match).

set_distinct

Set or remove the DISTINCT flag on a SELECT.

set_limit

Set the LIMIT on a SELECT.

set_offset

Set the OFFSET on a SELECT.