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Sieve: avoid feeding non-polygons into ST_DumpRings #20

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Sieve: avoid feeding non-polygons into ST_DumpRings #20

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4 changes: 2 additions & 2 deletions postgis-vt-util.sql
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Original file line number Diff line number Diff line change
Expand Up @@ -439,7 +439,7 @@ $func$
with exploded as (
-- First use ST_Dump to explode the input multipolygon
-- to individual polygons.
select (ST_Dump(g)).geom
select (ST_Dump(ST_CollectionExtract(g, 3))).geom
), rings as (
-- Next use ST_DumpRings to turn all of the inner and outer rings
-- into their own separate polygons.
Expand All @@ -459,7 +459,7 @@ $func$
with exploded as (
-- First use ST_Dump to explode the input multipolygon
-- to individual polygons.
select (ST_Dump(g)).geom
select (ST_Dump(ST_CollectionExtract(g, 3))).geom
), rings as (
-- Next use ST_DumpRings to turn all of the inner and outer rings
-- into their own separate polygons.
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4 changes: 2 additions & 2 deletions src/Sieve.sql
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Expand Up @@ -17,7 +17,7 @@ $func$
with exploded as (
-- First use ST_Dump to explode the input multipolygon
-- to individual polygons.
select (ST_Dump(g)).geom
select (ST_Dump(ST_CollectionExtract(g, 3))).geom
), rings as (
-- Next use ST_DumpRings to turn all of the inner and outer rings
-- into their own separate polygons.
Expand All @@ -37,7 +37,7 @@ $func$
with exploded as (
-- First use ST_Dump to explode the input multipolygon
-- to individual polygons.
select (ST_Dump(g)).geom
select (ST_Dump(ST_CollectionExtract(g, 3))).geom
), rings as (
-- Next use ST_DumpRings to turn all of the inner and outer rings
-- into their own separate polygons.
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7 changes: 7 additions & 0 deletions test/sql-test.sh
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Expand Up @@ -105,6 +105,13 @@ tf ST_AsText "Sieve(ST_GeomFromText('MULTIPOLYGON(\
((200 200,200 202,202 202,202 200,200 200)),\
((300 300,300 350,350 350,350 300,300 300)))'),10)" \
"MULTIPOLYGON(((0 0,0 100,100 100,100 0,0 0),(50 50,60 50,60 60,50 60,50 50)),((300 300,300 350,350 350,350 300,300 300)))"
tf ST_AsText "Sieve(ST_GeomFromText('GEOMETRYCOLLECTION(\
LINESTRING(-10 -10, -10 -100),\
MULTIPOLYGON(\
((0 0,0 100,100 100,100 0,0 0),(10 10,12 10,12 12,10 12,10 10),(50 50,60 50,60 60,50 60,50 50)),\
((200 200,200 202,202 202,202 200,200 200)),\
((300 300,300 350,350 350,350 300,300 300))))'),10)" \
"MULTIPOLYGON(((0 0,0 100,100 100,100 0,0 0),(50 50,60 50,60 60,50 60,50 50)),((300 300,300 350,350 350,350 300,300 300)))"

# SmartShrink
tf floor "ST_Area(SmartShrink(ST_Buffer(ST_MakePoint(0,0),5000),0.5,true))" \
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