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Rethink definition of pg_attribute.attcompression.

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Redefine '\0' (InvalidCompressionMethod) as meaning "if we need to
compress, use the current setting of default_toast_compression".
This allows '\0' to be a suitable default choice regardless of
datatype, greatly simplifying code paths that initialize tupledescs
and the like.  It seems like a more user-friendly approach as well,
because now the default compression choice doesn't migrate into table
definitions, meaning that changing default_toast_compression is
usually sufficient to flip an installation's behavior; one needn't
tediously issue per-column ALTER SET COMPRESSION commands.

Along the way, fix a few minor bugs and documentation issues
with the per-column-compression feature.  Adopt more robust
APIs for SetIndexStorageProperties and GetAttributeCompression.

Bump catversion because typical contents of attcompression will now
be different.  We could get away without doing that, but it seems
better to ensure v14 installations all agree on this.  (We already
forced initdb for beta2, anyway.)

Discussion: https://postgr.es/m/626613.1621787110@sss.pgh.pa.us
This commit is contained in:
Tom Lane
2021-05-27 13:24:24 -04:00
parent a717e5c771
commit e6241d8e03
29 changed files with 261 additions and 384 deletions
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34
src/bin/pg_dump/pg_backup_archiver.c
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@@ -86,7 +86,6 @@ static void _selectTableAccessMethod(ArchiveHandle *AH, const char *tableam);
static void processEncodingEntry(ArchiveHandle *AH, TocEntry *te);
static void processStdStringsEntry(ArchiveHandle *AH, TocEntry *te);
static void processSearchPathEntry(ArchiveHandle *AH, TocEntry *te);
static void processToastCompressionEntry(ArchiveHandle *AH, TocEntry *te);
static int _tocEntryRequired(TocEntry *te, teSection curSection, ArchiveHandle *AH);
static RestorePass _tocEntryRestorePass(TocEntry *te);
static bool _tocEntryIsACL(TocEntry *te);
@@ -2638,8 +2637,6 @@ ReadToc(ArchiveHandle *AH)
processStdStringsEntry(AH, te);
else if (strcmp(te->desc, "SEARCHPATH") == 0)
processSearchPathEntry(AH, te);
else if (strcmp(te->desc, "TOASTCOMPRESSION") == 0)
processToastCompressionEntry(AH, te);
}
}
@@ -2697,29 +2694,6 @@ processSearchPathEntry(ArchiveHandle *AH, TocEntry *te)
AH->public.searchpath = pg_strdup(te->defn);
}
static void
processToastCompressionEntry(ArchiveHandle *AH, TocEntry *te)
{
/* te->defn should have the form SET default_toast_compression = 'x'; */
char *defn = pg_strdup(te->defn);
char *ptr1;
char *ptr2 = NULL;
ptr1 = strchr(defn, '\'');
if (ptr1)
ptr2 = strchr(++ptr1, '\'');
if (ptr2)
{
*ptr2 = '\0';
AH->public.default_toast_compression = pg_strdup(ptr1);
}
else
fatal("invalid TOASTCOMPRESSION item: %s",
te->defn);
free(defn);
}
static void
StrictNamesCheck(RestoreOptions *ropt)
{
@@ -2779,8 +2753,7 @@ _tocEntryRequired(TocEntry *te, teSection curSection, ArchiveHandle *AH)
/* These items are treated specially */
if (strcmp(te->desc, "ENCODING") == 0 ||
strcmp(te->desc, "STDSTRINGS") == 0 ||
strcmp(te->desc, "SEARCHPATH") == 0 ||
strcmp(te->desc, "TOASTCOMPRESSION") == 0)
strcmp(te->desc, "SEARCHPATH") == 0)
return REQ_SPECIAL;
/*
@@ -3103,11 +3076,6 @@ _doSetFixedOutputState(ArchiveHandle *AH)
if (AH->public.searchpath)
ahprintf(AH, "%s", AH->public.searchpath);
/* Select the dump-time default_toast_compression */
if (AH->public.default_toast_compression)
ahprintf(AH, "SET default_toast_compression = '%s';\n",
AH->public.default_toast_compression);
/* Make sure function checking is disabled */
ahprintf(AH, "SET check_function_bodies = false;\n");