parse_collate.c assign collation information in completed expressions
parse_cte.c handle Common Table Expressions (WITH clauses)
parse_expr.c handle expressions like col, col + 3, x = 3 or x = 4
+parse_enr.c handle ephemeral named rels (trigger transition tables, ...)
parse_func.c handle functions, table.column and column identifiers
+parse_jsontable.c handle JSON_TABLE
+parse_merge.c handle MERGE
parse_node.c create nodes for various structures
parse_oper.c handle operators in expressions
parse_param.c handle Params (for the cases used in the core backend)