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<DIV>Hi</DIV>
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<DIV>I have a table with five rows each holding a linestring geometry.</DIV>
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<DIV>Each of theses geometries indicate true on an st_isvalid query.</DIV>
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<DIV>All rows are displayed as expected in QGis.</DIV>
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<DIV>However, when I run an st_union or st_collect query on all five rows the
return is empty.</DIV>
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<DIV>If I select only four of the five rows (any four) it returns a
value.</DIV>
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<DIV>Can anyone suggest what type of problem I should look for? Is there some
restriction on these functions?</DIV>
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<DIV>Bob</DIV>
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