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Commitaa25d10

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Fix up pg_dump's handling of per-attribute compression options.
The approach used in commitbbe0a81 would've been disastrous forportability of dumps. Instead handle non-default compression optionsin separate ALTER TABLE commands. This reduces chatter for thecommon case where most columns are compressed the same way, and itmakes it possible to restore the dump to a server that lacks anyknowledge of per-attribute compression options (so long as you'rewilling to ignore syntax errors from the ALTER TABLE commands).There's a whole lot left to do to mop up afterbbe0a81, butI'm fast-tracking this part because we need to see if it'senough to make the buildfarm's cross-version-upgrade tests happy.Justin Pryzby and Tom LaneDiscussion:https://postgr.es/m/20210119190720.GL8560@telsasoft.com
1 parente835e89 commitaa25d10

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5 files changed

+134
-51
lines changed

5 files changed

+134
-51
lines changed

‎src/bin/pg_dump/pg_backup.h

Lines changed: 3 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -159,8 +159,8 @@ typedef struct _dumpOptions
159159
intno_publications;
160160
intno_subscriptions;
161161
intno_synchronized_snapshots;
162-
intno_unlogged_table_data;
163162
intno_toast_compression;
163+
intno_unlogged_table_data;
164164
intserializable_deferrable;
165165
intdisable_triggers;
166166
intoutputNoTablespaces;
@@ -209,6 +209,8 @@ typedef struct Archive
209209

210210
/* other important stuff */
211211
char*searchpath;/* search_path to set during restore */
212+
char*default_toast_compression;/* default TOAST compression to
213+
* set during restore */
212214
char*use_role;/* Issue SET ROLE to this */
213215

214216
/* error handling */

‎src/bin/pg_dump/pg_backup_archiver.c

Lines changed: 33 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -86,6 +86,7 @@ static void _selectTableAccessMethod(ArchiveHandle *AH, const char *tableam);
8686
staticvoidprocessEncodingEntry(ArchiveHandle*AH,TocEntry*te);
8787
staticvoidprocessStdStringsEntry(ArchiveHandle*AH,TocEntry*te);
8888
staticvoidprocessSearchPathEntry(ArchiveHandle*AH,TocEntry*te);
89+
staticvoidprocessToastCompressionEntry(ArchiveHandle*AH,TocEntry*te);
8990
staticint_tocEntryRequired(TocEntry*te,teSectioncurSection,ArchiveHandle*AH);
9091
staticRestorePass_tocEntryRestorePass(TocEntry*te);
9192
staticbool_tocEntryIsACL(TocEntry*te);
@@ -2696,6 +2697,8 @@ ReadToc(ArchiveHandle *AH)
26962697
processStdStringsEntry(AH,te);
26972698
elseif (strcmp(te->desc,"SEARCHPATH")==0)
26982699
processSearchPathEntry(AH,te);
2700+
elseif (strcmp(te->desc,"TOASTCOMPRESSION")==0)
2701+
processToastCompressionEntry(AH,te);
26992702
}
27002703
}
27012704

@@ -2753,6 +2756,29 @@ processSearchPathEntry(ArchiveHandle *AH, TocEntry *te)
27532756
AH->public.searchpath=pg_strdup(te->defn);
27542757
}
27552758

2759+
staticvoid
2760+
processToastCompressionEntry(ArchiveHandle*AH,TocEntry*te)
2761+
{
2762+
/* te->defn should have the form SET default_toast_compression = 'x'; */
2763+
char*defn=pg_strdup(te->defn);
2764+
char*ptr1;
2765+
char*ptr2=NULL;
2766+
2767+
ptr1=strchr(defn,'\'');
2768+
if (ptr1)
2769+
ptr2=strchr(++ptr1,'\'');
2770+
if (ptr2)
2771+
{
2772+
*ptr2='\0';
2773+
AH->public.default_toast_compression=pg_strdup(ptr1);
2774+
}
2775+
else
2776+
fatal("invalid TOASTCOMPRESSION item: %s",
2777+
te->defn);
2778+
2779+
free(defn);
2780+
}
2781+
27562782
staticvoid
27572783
StrictNamesCheck(RestoreOptions*ropt)
27582784
{
@@ -2812,7 +2838,8 @@ _tocEntryRequired(TocEntry *te, teSection curSection, ArchiveHandle *AH)
28122838
/* These items are treated specially */
28132839
if (strcmp(te->desc,"ENCODING")==0||
28142840
strcmp(te->desc,"STDSTRINGS")==0||
2815-
strcmp(te->desc,"SEARCHPATH")==0)
2841+
strcmp(te->desc,"SEARCHPATH")==0||
2842+
strcmp(te->desc,"TOASTCOMPRESSION")==0)
28162843
returnREQ_SPECIAL;
28172844

28182845
/*
@@ -3135,6 +3162,11 @@ _doSetFixedOutputState(ArchiveHandle *AH)
31353162
if (AH->public.searchpath)
31363163
ahprintf(AH,"%s",AH->public.searchpath);
31373164

3165+
/* Select the dump-time default_toast_compression */
3166+
if (AH->public.default_toast_compression)
3167+
ahprintf(AH,"SET default_toast_compression = '%s';\n",
3168+
AH->public.default_toast_compression);
3169+
31383170
/* Make sure function checking is disabled */
31393171
ahprintf(AH,"SET check_function_bodies = false;\n");
31403172

‎src/bin/pg_dump/pg_dump.c

Lines changed: 91 additions & 42 deletions
Original file line numberDiff line numberDiff line change
@@ -270,6 +270,7 @@ static void dumpDatabaseConfig(Archive *AH, PQExpBuffer outbuf,
270270
static void dumpEncoding(Archive *AH);
271271
static void dumpStdStrings(Archive *AH);
272272
static void dumpSearchPath(Archive *AH);
273+
static void dumpToastCompression(Archive *AH);
273274
static void binary_upgrade_set_type_oids_by_type_oid(Archive *fout,
274275
PQExpBuffer upgrade_buffer,
275276
Oid pg_type_oid,
@@ -384,10 +385,10 @@ main(int argc, char **argv)
384385
{"no-comments", no_argument, &dopt.no_comments, 1},
385386
{"no-publications", no_argument, &dopt.no_publications, 1},
386387
{"no-security-labels", no_argument, &dopt.no_security_labels, 1},
387-
{"no-synchronized-snapshots", no_argument, &dopt.no_synchronized_snapshots, 1},
388-
{"no-unlogged-table-data", no_argument, &dopt.no_unlogged_table_data, 1},
389388
{"no-subscriptions", no_argument, &dopt.no_subscriptions, 1},
389+
{"no-synchronized-snapshots", no_argument, &dopt.no_synchronized_snapshots, 1},
390390
{"no-toast-compression", no_argument, &dopt.no_toast_compression, 1},
391+
{"no-unlogged-table-data", no_argument, &dopt.no_unlogged_table_data, 1},
391392
{"no-sync", no_argument, NULL, 7},
392393
{"on-conflict-do-nothing", no_argument, &dopt.do_nothing, 1},
393394
{"rows-per-insert", required_argument, NULL, 10},
@@ -909,10 +910,14 @@ main(int argc, char **argv)
909910
* order.
910911
*/
911912

912-
/* First the special ENCODING, STDSTRINGS, and SEARCHPATH entries. */
913+
/*
914+
* First the special entries for ENCODING, STDSTRINGS, SEARCHPATH and
915+
* TOASTCOMPRESSION.
916+
*/
913917
dumpEncoding(fout);
914918
dumpStdStrings(fout);
915919
dumpSearchPath(fout);
920+
dumpToastCompression(fout);
916921

917922
/* The database items are always next, unless we don't want them at all */
918923
if (dopt.outputCreateDB)
@@ -1048,9 +1053,9 @@ help(const char *progname)
10481053
printf(_(" --no-publications do not dump publications\n"));
10491054
printf(_(" --no-security-labels do not dump security label assignments\n"));
10501055
printf(_(" --no-subscriptions do not dump subscriptions\n"));
1051-
printf(_(" --no-toast-compression do not dump toast compression methods\n"));
10521056
printf(_(" --no-synchronized-snapshots do not use synchronized snapshots in parallel jobs\n"));
10531057
printf(_(" --no-tablespaces do not dump tablespace assignments\n"));
1058+
printf(_(" --no-toast-compression do not dump toast compression methods\n"));
10541059
printf(_(" --no-unlogged-table-data do not dump unlogged table data\n"));
10551060
printf(_(" --on-conflict-do-nothing add ON CONFLICT DO NOTHING to INSERT commands\n"));
10561061
printf(_(" --quote-all-identifiers quote all identifiers, even if not key words\n"));
@@ -3321,6 +3326,49 @@ dumpSearchPath(Archive *AH)
33213326
destroyPQExpBuffer(path);
33223327
}
33233328

3329+
/*
3330+
* dumpToastCompression: save the dump-time default TOAST compression in the
3331+
* archive
3332+
*/
3333+
static void
3334+
dumpToastCompression(Archive *AH)
3335+
{
3336+
const char *toast_compression;
3337+
PQExpBuffer qry;
3338+
PGresult *res;
3339+
3340+
if (AH->remoteVersion < 140000 || AH->dopt->no_toast_compression)
3341+
{
3342+
/* server doesn't support compression, or we don't care */
3343+
return;
3344+
}
3345+
3346+
res = ExecuteSqlQueryForSingleRow(AH, "SHOW default_toast_compression");
3347+
toast_compression = PQgetvalue(res, 0, 0);
3348+
3349+
qry = createPQExpBuffer();
3350+
appendPQExpBufferStr(qry, "SET default_toast_compression = ");
3351+
appendStringLiteralAH(qry, toast_compression, AH);
3352+
appendPQExpBufferStr(qry, ";\n");
3353+
3354+
pg_log_info("saving default_toast_compression = %s", toast_compression);
3355+
3356+
ArchiveEntry(AH, nilCatalogId, createDumpId(),
3357+
ARCHIVE_OPTS(.tag = "TOASTCOMPRESSION",
3358+
.description = "TOASTCOMPRESSION",
3359+
.section = SECTION_PRE_DATA,
3360+
.createStmt = qry->data));
3361+
3362+
/*
3363+
* Also save it in AH->default_toast_compression, in case we're doing
3364+
* plain text dump.
3365+
*/
3366+
AH->default_toast_compression = pg_strdup(toast_compression);
3367+
3368+
PQclear(res);
3369+
destroyPQExpBuffer(qry);
3370+
}
3371+
33243372

33253373
/*
33263374
* getBlobs:
@@ -8619,7 +8667,6 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
86198667
{
86208668
DumpOptions *dopt = fout->dopt;
86218669
PQExpBuffer q = createPQExpBuffer();
8622-
boolcreateWithCompression;
86238670

86248671
for (int i = 0; i < numTables; i++)
86258672
{
@@ -8686,6 +8733,13 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
86868733
appendPQExpBufferStr(q,
86878734
"0 AS attcollation,\n");
86888735

8736+
if (fout->remoteVersion >= 140000)
8737+
appendPQExpBuffer(q,
8738+
"a.attcompression AS attcompression,\n");
8739+
else
8740+
appendPQExpBuffer(q,
8741+
"'' AS attcompression,\n");
8742+
86898743
if (fout->remoteVersion >= 90200)
86908744
appendPQExpBufferStr(q,
86918745
"pg_catalog.array_to_string(ARRAY("
@@ -8705,15 +8759,6 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
87058759
appendPQExpBufferStr(q,
87068760
"'' AS attidentity,\n");
87078761

8708-
createWithCompression = (fout->remoteVersion >= 140000);
8709-
8710-
if (createWithCompression)
8711-
appendPQExpBuffer(q,
8712-
"a.attcompression AS attcompression,\n");
8713-
else
8714-
appendPQExpBuffer(q,
8715-
"NULL AS attcompression,\n");
8716-
87178762
if (fout->remoteVersion >= 110000)
87188763
appendPQExpBufferStr(q,
87198764
"CASE WHEN a.atthasmissing AND NOT a.attisdropped "
@@ -8757,9 +8802,9 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
87578802
tbinfo->attislocal = (bool *) pg_malloc(ntups * sizeof(bool));
87588803
tbinfo->attoptions = (char **) pg_malloc(ntups * sizeof(char *));
87598804
tbinfo->attcollation = (Oid *) pg_malloc(ntups * sizeof(Oid));
8805+
tbinfo->attcompression = (char *) pg_malloc(ntups * sizeof(char));
87608806
tbinfo->attfdwoptions = (char **) pg_malloc(ntups * sizeof(char *));
87618807
tbinfo->attmissingval = (char **) pg_malloc(ntups * sizeof(char *));
8762-
tbinfo->attcompression = (char *) pg_malloc(ntups * sizeof(char *));
87638808
tbinfo->notnull = (bool *) pg_malloc(ntups * sizeof(bool));
87648809
tbinfo->inhNotNull = (bool *) pg_malloc(ntups * sizeof(bool));
87658810
tbinfo->attrdefs = (AttrDefInfo **) pg_malloc(ntups * sizeof(AttrDefInfo *));
@@ -8786,9 +8831,9 @@ getTableAttrs(Archive *fout, TableInfo *tblinfo, int numTables)
87868831
tbinfo->notnull[j] = (PQgetvalue(res, j, PQfnumber(res, "attnotnull"))[0] == 't');
87878832
tbinfo->attoptions[j] = pg_strdup(PQgetvalue(res, j, PQfnumber(res, "attoptions")));
87888833
tbinfo->attcollation[j] = atooid(PQgetvalue(res, j, PQfnumber(res, "attcollation")));
8834+
tbinfo->attcompression[j] = *(PQgetvalue(res, j, PQfnumber(res, "attcompression")));
87898835
tbinfo->attfdwoptions[j] = pg_strdup(PQgetvalue(res, j, PQfnumber(res, "attfdwoptions")));
87908836
tbinfo->attmissingval[j] = pg_strdup(PQgetvalue(res, j, PQfnumber(res, "attmissingval")));
8791-
tbinfo->attcompression[j] = *(PQgetvalue(res, j, PQfnumber(res, "attcompression")));
87928837
tbinfo->attrdefs[j] = NULL; /* fix below */
87938838
if (PQgetvalue(res, j, PQfnumber(res, "atthasdef"))[0] == 't')
87948839
hasdefaults = true;
@@ -15905,31 +15950,6 @@ dumpTableSchema(Archive *fout, const TableInfo *tbinfo)
1590515950
tbinfo->atttypnames[j]);
1590615951
}
1590715952

15908-
/*
15909-
* Attribute compression
15910-
*/
15911-
if (!dopt->no_toast_compression &&
15912-
tbinfo->attcompression != NULL)
15913-
{
15914-
char *cmname;
15915-
15916-
switch (tbinfo->attcompression[j])
15917-
{
15918-
case 'p':
15919-
cmname = "pglz";
15920-
break;
15921-
case 'l':
15922-
cmname = "lz4";
15923-
break;
15924-
default:
15925-
cmname = NULL;
15926-
break;
15927-
}
15928-
15929-
if (cmname != NULL)
15930-
appendPQExpBuffer(q, " COMPRESSION %s", cmname);
15931-
}
15932-
1593315953
if (print_default)
1593415954
{
1593515955
if (tbinfo->attgenerated[j] == ATTRIBUTE_GENERATED_STORED)
@@ -16348,7 +16368,36 @@ dumpTableSchema(Archive *fout, const TableInfo *tbinfo)
1634816368
qualrelname,
1634916369
fmtId(tbinfo->attnames[j]),
1635016370
tbinfo->attfdwoptions[j]);
16351-
}
16371+
16372+
/*
16373+
* Dump per-column compression, if different from default.
16374+
*/
16375+
if (!dopt->no_toast_compression)
16376+
{
16377+
const char *cmname;
16378+
16379+
switch (tbinfo->attcompression[j])
16380+
{
16381+
case 'p':
16382+
cmname = "pglz";
16383+
break;
16384+
case 'l':
16385+
cmname = "lz4";
16386+
break;
16387+
default:
16388+
cmname = NULL;
16389+
break;
16390+
}
16391+
16392+
if (cmname != NULL &&
16393+
(fout->default_toast_compression == NULL ||
16394+
strcmp(cmname, fout->default_toast_compression) != 0))
16395+
appendPQExpBuffer(q, "ALTER %sTABLE ONLY %s ALTER COLUMN %s SET COMPRESSION %s;\n",
16396+
foreign, qualrelname,
16397+
fmtId(tbinfo->attnames[j]),
16398+
cmname);
16399+
}
16400+
}/* end loop over columns */
1635216401

1635316402
if (ftoptions)
1635416403
free(ftoptions);

‎src/bin/pg_dump/pg_dump.h

Lines changed: 1 addition & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -316,6 +316,7 @@ typedef struct _tableInfo
316316
bool*attislocal;/* true if attr has local definition */
317317
char**attoptions;/* per-attribute options */
318318
Oid*attcollation;/* per-attribute collation selection */
319+
char*attcompression;/* per-attribute compression method */
319320
char**attfdwoptions;/* per-attribute fdw options */
320321
char**attmissingval;/* per attribute missing value */
321322
bool*notnull;/* NOT NULL constraints on attributes */
@@ -326,7 +327,6 @@ typedef struct _tableInfo
326327
char*partbound;/* partition bound definition */
327328
boolneeds_override;/* has GENERATED ALWAYS AS IDENTITY */
328329
char*amname;/* relation access method */
329-
char*attcompression;/* per-attribute current compression method */
330330

331331
/*
332332
* Stuff computed only for dumpable tables.

‎src/bin/pg_dump/t/002_pg_dump.pl

Lines changed: 6 additions & 6 deletions
Original file line numberDiff line numberDiff line change
@@ -2284,9 +2284,9 @@
22842284
regexp => qr/^
22852285
\QCREATE TABLE dump_test.test_table (\E\n
22862286
\s+\Qcol1 integer NOT NULL,\E\n
2287-
\s+\Qcol2 text COMPRESSION\E\D*,\n
2288-
\s+\Qcol3 text COMPRESSION\E\D*,\n
2289-
\s+\Qcol4 text COMPRESSION\E\D*,\n
2287+
\s+\Qcol2 text,\E\n
2288+
\s+\Qcol3 text,\E\n
2289+
\s+\Qcol4 text,\E\n
22902290
\s+\QCONSTRAINT test_table_col1_check CHECK ((col1 <= 1000))\E\n
22912291
\Q)\E\n
22922292
\QWITH (autovacuum_enabled='false', fillfactor='80');\E\n/xm,
@@ -2326,7 +2326,7 @@
23262326
regexp => qr/^
23272327
\QCREATE TABLE dump_test.test_second_table (\E
23282328
\n\s+\Qcol1 integer,\E
2329-
\n\s+\Qcol2 text COMPRESSION\E\D*
2329+
\n\s+\Qcol2 text\E
23302330
\n\);
23312331
/xm,
23322332
like =>
@@ -2441,7 +2441,7 @@
24412441
\n\s+\Qcol1 integer,\E
24422442
\n\s+\Qcol2 boolean,\E
24432443
\n\s+\Qcol3 boolean,\E
2444-
\n\s+\Qcol4 bit(5) COMPRESSION\E\D*,
2444+
\n\s+\Qcol4 bit(5),\E
24452445
\n\s+\Qcol5 double precision\E
24462446
\n\);
24472447
/xm,
@@ -2459,7 +2459,7 @@
24592459
regexp => qr/^
24602460
\QCREATE TABLE dump_test.test_table_identity (\E\n
24612461
\s+\Qcol1 integer NOT NULL,\E\n
2462-
\s+\Qcol2 text COMPRESSION\E\D*\n
2462+
\s+\Qcol2 text\E\n
24632463
\);
24642464
.*
24652465
\QALTER TABLE dump_test.test_table_identity ALTER COLUMN col1 ADD GENERATED ALWAYS AS IDENTITY (\E\n

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