79c2ec929d
This PR adds a layer for `highway=motorway_junction` features. This implementation of highway exits in the transportation_name layer add to the existing layer table structure, and renames the internal column name from "construction" (which was already overloaded with non-construction usages) to "subclass", which will be less confusing to future developers. The string 'junction' is used as the universal sub-class for highway exits. A new documentation PR has been opened at openmaptiles/www.openmaptiles.org#69 to reflect these changes in the documentation.
58 lines
1.2 KiB
PL/PgSQL
58 lines
1.2 KiB
PL/PgSQL
CREATE OR REPLACE FUNCTION highway_to_val(hwy_class varchar)
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RETURNS int
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IMMUTABLE
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LANGUAGE plpgsql
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AS $$
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BEGIN
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CASE hwy_class
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WHEN 'motorway' THEN RETURN 6;
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WHEN 'trunk' THEN RETURN 5;
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WHEN 'primary' THEN RETURN 4;
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WHEN 'secondary' THEN RETURN 3;
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WHEN 'tertiary' THEN RETURN 2;
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WHEN 'unclassified' THEN RETURN 1;
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else RETURN 0;
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END CASE;
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END;
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$$;
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CREATE OR REPLACE FUNCTION val_to_highway(hwy_val int)
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RETURNS varchar
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IMMUTABLE
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LANGUAGE plpgsql
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AS $$
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BEGIN
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CASE hwy_val
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WHEN 6 THEN RETURN 'motorway';
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WHEN 5 THEN RETURN 'trunk';
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WHEN 4 THEN RETURN 'primary';
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WHEN 3 THEN RETURN 'secondary';
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WHEN 2 THEN RETURN 'tertiary';
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WHEN 1 THEN RETURN 'unclassified';
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else RETURN null;
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END CASE;
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END;
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$$;
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CREATE OR REPLACE FUNCTION highest_hwy_sfunc(agg_state varchar, hwy_class varchar)
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RETURNS varchar
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IMMUTABLE
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LANGUAGE plpgsql
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AS $$
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BEGIN
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RETURN val_to_highway(
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GREATEST(
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highway_to_val(agg_state),
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highway_to_val(hwy_class)
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)
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);
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END;
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$$;
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DROP AGGREGATE IF EXISTS highest_highway (varchar);
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CREATE AGGREGATE highest_highway (varchar)
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(
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sfunc = highest_hwy_sfunc,
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stype = varchar
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);
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