text: /*-------------------------------------------------------------------------
   *
   * parse_collate.h
   *	Routines for assigning collation information.
   *
   *
   * Portions Copyright (c) 1996-2016, PostgreSQL Global Development Group
   * Portions Copyright (c) 1994, Regents of the University of California
   *
   * src/include/parser/parse_collate.h
   *
   *-------------------------------------------------------------------------
   */
  #ifndef PARSE_COLLATE_H
  #define PARSE_COLLATE_H
  
  #include "parser/parse_node.h"
  
  extern void assign_query_collations(ParseState *pstate, Query *query);
  
  extern void assign_list_collations(ParseState *pstate, List *exprs);
  
  extern void assign_expr_collations(ParseState *pstate, Node *expr);
  
  extern Oid	select_common_collation(ParseState *pstate, List *exprs, bool none_ok);
  
  #endif   /* PARSE_COLLATE_H */
  