st_union() in some queries produces segfaults and/or ERROR: array size exceeds the maximum allowed (134217727)

[mgleahy]

As indicated in the subject, in some circumstances the st_union() function would result in either a segfault or a trapped error that would be reported as

ERROR: array size exceeds the maximum allowed (134217727)

Investigation that concluded on the users mailing list ( http://postgis.refractions.net/pipermail/postgis-users/2010-March/026245.html) indicates that this is due to "some memory management changes which required changes to array_agg() and which had some risk of causing problems for other sites with similar coding"

The patch attached appears to fix this.

[mgleahy]

Patch that fixes this bug.

[mgleahy]

P.S. - forgot to cc. the users list on my last reply. Thanks to everyone that helped solve this.

[pramsey]

Patched in 1.5 at r5453 and in trunk at r5454

[pramsey]

And in 1.4 at r5455.