Copy collencoding in CREATE COLLATION / FROM

This command used to compute the collencoding entry like when a
completely new collation is created.  But for example when copying the
"C" collation, this would then result in a collation that has a
collencoding entry for the current database encoding rather than -1,
thus not making an exact copy.  This has probably no practical impact,
but making this change keeps the catalog contents neat.

Reported-by: Tom Lane <tgl@sss.pgh.pa.us>

diff --git a/src/backend/commands/collationcmds.c b/src/backend/commands/collationcmds.c
index 7f2ce4db4c67e463494c654cabbb6686e4992f59..418f7342c77fccb4c7bb5783cdf1f6f5b343b35d 100644 (file)
--- a/src/backend/commands/collationcmds.c
+++ b/src/backend/commands/collationcmds.c
@@ -64,7 +64,7 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
    char       *collcollate = NULL;
    char       *collctype = NULL;
    char       *collproviderstr = NULL;
-   int         collencoding;
+   int         collencoding = 0;
    char        collprovider = 0;
    char       *collversion = NULL;
    Oid         newoid;
@@ -126,6 +126,7 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
        collcollate = pstrdup(NameStr(((Form_pg_collation) GETSTRUCT(tp))->collcollate));
        collctype = pstrdup(NameStr(((Form_pg_collation) GETSTRUCT(tp))->collctype));
        collprovider = ((Form_pg_collation) GETSTRUCT(tp))->collprovider;
+       collencoding = ((Form_pg_collation) GETSTRUCT(tp))->collencoding;
 
        ReleaseSysCache(tp);
 
@@ -185,12 +186,15 @@ DefineCollation(ParseState *pstate, List *names, List *parameters, bool if_not_e
                (errcode(ERRCODE_INVALID_OBJECT_DEFINITION),
                 errmsg("parameter \"lc_ctype\" must be specified")));
 
-   if (collprovider == COLLPROVIDER_ICU)
-       collencoding = -1;
-   else
+   if (!fromEl)
    {
-       collencoding = GetDatabaseEncoding();
-       check_encoding_locale_matches(collencoding, collcollate, collctype);
+       if (collprovider == COLLPROVIDER_ICU)
+           collencoding = -1;
+       else
+       {
+           collencoding = GetDatabaseEncoding();
+           check_encoding_locale_matches(collencoding, collcollate, collctype);
+       }
    }
 
    if (!collversion)