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Fix pg_dump to not emit invalid SQL for an empty operator class.

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If an operator class has no operators or functions, and doesn't need
a STORAGE clause, we emitted "CREATE OPERATOR CLASS ... AS ;" which
is syntactically invalid.  Fix by forcing a STORAGE clause to be
emitted anyway in this case.

(At some point we might consider changing the grammar to allow CREATE
OPERATOR CLASS without an opclass_item_list.  But probably we'd want to
omit the AS in that case, so that wouldn't fix this pg_dump issue anyway.)

It's been like this all along, so back-patch to all supported branches.

Daniel Gustafsson, tweaked by me to avoid a dangling-pointer bug

Discussion: https://postgr.es/m/D9E5FC64-7A37-4F3D-B946-7E4FB468F88A@yesql.se
This commit is contained in:
Tom Lane 2017-05-26 12:51:05 -04:00
parent 9c34a05b7d
commit 0461b66e36
1 changed files with 13 additions and 1 deletions
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14
src/bin/pg_dump/pg_dump.c
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@ -12440,7 +12440,8 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
i_opcfamilynsp = PQfnumber(res, "opcfamilynsp");
i_amname = PQfnumber(res, "amname");
opcintype = PQgetvalue(res, 0, i_opcintype);
/* opcintype may still be needed after we PQclear res */
opcintype = pg_strdup(PQgetvalue(res, 0, i_opcintype));
opckeytype = PQgetvalue(res, 0, i_opckeytype);
opcdefault = PQgetvalue(res, 0, i_opcdefault);
/* opcfamily will still be needed after we PQclear res */
@ -12674,6 +12675,15 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
PQclear(res);
/*
* If needComma is still false it means we haven't added anything after
* the AS keyword. To avoid printing broken SQL, append a dummy STORAGE
* clause with the same datatype. This isn't sanctioned by the
* documentation, but actually DefineOpClass will treat it as a no-op.
*/
if (!needComma)
appendPQExpBuffer(q, "STORAGE %s", opcintype);
appendPQExpBufferStr(q, ";\n");
appendPQExpBuffer(labelq, "OPERATOR CLASS %s",
@ -12701,6 +12711,8 @@ dumpOpclass(Archive *fout, OpclassInfo *opcinfo)
opcinfo->dobj.namespace->dobj.name, opcinfo->rolname,
opcinfo->dobj.catId, 0, opcinfo->dobj.dumpId);
free(opcintype);
free(opcfamily);
free(amname);
destroyPQExpBuffer(query);
destroyPQExpBuffer(q);