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\i wm.sql
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drop table if exists debug_wm;
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create table debug_wm(name text, way geometry, props json);
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drop table if exists demo_wm;
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create table demo_wm (name text, i bigint, way geometry);
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insert into demo_wm (name, way) select name, ST_SimplifyWM(way, true) from agg_rivers;
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