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restrict geometry size for SQLite

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Sarah Hoffmann
2023-10-19 21:24:53 +02:00
parent 84d6b481ae
commit a9ac68a729
1 changed files with 12 additions and 0 deletions
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12
nominatim/tools/convert_sqlite.py
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@@ -138,6 +138,18 @@ class SqliteWriter:
""" """
columns = self.src.t.meta.tables[table].c columns = self.src.t.meta.tables[table].c
if table == 'placex':
# SQLite struggles with Geometries that are larger than 5MB,
# so simplify those.
return sa.select(*(c for c in columns if not isinstance(c.type, Geometry)),
sa.func.ST_AsText(columns.centroid).label('centroid'),
sa.func.ST_AsText(
sa.case((sa.func.ST_MemSize(columns.geometry) < 5000000,
columns.geometry),
else_=sa.func.ST_SimplifyPreserveTopology(
columns.geometry, 0.0001)
)).label('geometry'))
sql = sa.select(*(sa.func.ST_AsText(c).label(c.name) sql = sa.select(*(sa.func.ST_AsText(c).label(c.name)
if isinstance(c.type, Geometry) else c for c in columns)) if isinstance(c.type, Geometry) else c for c in columns))