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Reorder pg_sequence columns to avoid alignment issue

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On AIX, doubles are aligned at 4 bytes, but int64 is aligned at 8 bytes.
Our code assumes that doubles have alignment that can also be applied to
int64, but that fails in this case.  One effect is that
heap_form_tuple() writes tuples in a different layout than
Form_pg_sequence expects.

Rather than rewrite the whole alignment code, work around the issue by
reordering the columns in pg_sequence so that the first int64 column
naturally comes out at an 8-byte boundary.
This commit is contained in:
Peter Eisentraut
2016-12-21 12:00:00 -05:00
parent ecbdc4c555
commit f3b421da5f
4 changed files with 17 additions and 17 deletions
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14
doc/src/sgml/catalogs.sgml
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@ -5627,6 +5627,13 @@
<entry>The OID of the <structname>pg_class</> entry for this sequence</entry>
</row>
<row>
<entry><structfield>seqcycle</structfield></entry>
<entry><type>bool</type></entry>
<entry></entry>
<entry>Whether the sequence cycles</entry>
</row>
<row>
<entry><structfield>seqstart</structfield></entry>
<entry><type>int8</type></entry>
@ -5661,13 +5668,6 @@
<entry></entry>
<entry>Cache size of the sequence</entry>
</row>
<row>
<entry><structfield>seqcycle</structfield></entry>
<entry><type>bool</type></entry>
<entry></entry>
<entry>Whether the sequence cycles</entry>
</row>
</tbody>
</tgroup>
</table>