Changes between Initial Version and Version 1 of Ticket #4469, comment 4


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Timestamp:
Aug 25, 2019, 7:53:04 AM (5 years ago)
Author:
tsw

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  • Ticket #4469, comment 4

    initial v1  
    1 I've further tested this today and calls to public.ST_UnaryUnion in ST_Concave hull don't make any difference as they are only applied to polgyon geometries, and in this case, lines are the problem.
     1I've further tested this today and calls to public.ST_UnaryUnion in ST_Concave hull don't make any difference as they are only applied to polygon geometries, and in this case, lines are the problem.
    22
    33HOWEVER, the ST_UnaryUnion call made at the end of _st_concavehull added in response to issue 3638 is the source of this problem. If this is commented out the query runs instantly. Not sure if there is another way to address 3638, but this change causes the slowdown I document here.