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Sarah Hoffmann
221
src/nominatim_api/sql/sqlalchemy_functions.py
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221
src/nominatim_api/sql/sqlalchemy_functions.py
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# SPDX-License-Identifier: GPL-3.0-or-later
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#
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# This file is part of Nominatim. (https://nominatim.org)
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#
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# Copyright (C) 2024 by the Nominatim developer community.
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# For a full list of authors see the git log.
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"""
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Custom functions and expressions for SQLAlchemy.
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"""
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from __future__ import annotations
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from typing import Any
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import sqlalchemy as sa
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from sqlalchemy.ext.compiler import compiles
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from nominatim_core.typing import SaColumn
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# pylint: disable=all
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class PlacexGeometryReverseLookuppolygon(sa.sql.functions.GenericFunction[Any]):
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""" Check for conditions that allow partial index use on
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'idx_placex_geometry_reverse_lookupPolygon'.
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Needs to be constant, so that the query planner picks them up correctly
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in prepared statements.
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"""
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name = 'PlacexGeometryReverseLookuppolygon'
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inherit_cache = True
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@compiles(PlacexGeometryReverseLookuppolygon) # type: ignore[no-untyped-call, misc]
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def _default_intersects(element: PlacexGeometryReverseLookuppolygon,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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return ("(ST_GeometryType(placex.geometry) in ('ST_Polygon', 'ST_MultiPolygon')"
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" AND placex.rank_address between 4 and 25"
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" AND placex.type != 'postcode'"
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" AND placex.name is not null"
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" AND placex.indexed_status = 0"
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" AND placex.linked_place_id is null)")
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@compiles(PlacexGeometryReverseLookuppolygon, 'sqlite') # type: ignore[no-untyped-call, misc]
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def _sqlite_intersects(element: PlacexGeometryReverseLookuppolygon,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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return ("(ST_GeometryType(placex.geometry) in ('POLYGON', 'MULTIPOLYGON')"
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" AND placex.rank_address between 4 and 25"
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" AND placex.type != 'postcode'"
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" AND placex.name is not null"
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" AND placex.indexed_status = 0"
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" AND placex.linked_place_id is null)")
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class IntersectsReverseDistance(sa.sql.functions.GenericFunction[Any]):
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name = 'IntersectsReverseDistance'
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inherit_cache = True
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def __init__(self, table: sa.Table, geom: SaColumn) -> None:
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super().__init__(table.c.geometry,
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table.c.rank_search, geom)
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self.tablename = table.name
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@compiles(IntersectsReverseDistance) # type: ignore[no-untyped-call, misc]
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def default_reverse_place_diameter(element: IntersectsReverseDistance,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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table = element.tablename
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return f"({table}.rank_address between 4 and 25"\
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f" AND {table}.type != 'postcode'"\
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f" AND {table}.name is not null"\
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f" AND {table}.linked_place_id is null"\
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f" AND {table}.osm_type = 'N'" + \
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" AND ST_Buffer(%s, reverse_place_diameter(%s)) && %s)" % \
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tuple(map(lambda c: compiler.process(c, **kw), element.clauses))
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@compiles(IntersectsReverseDistance, 'sqlite') # type: ignore[no-untyped-call, misc]
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def sqlite_reverse_place_diameter(element: IntersectsReverseDistance,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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geom1, rank, geom2 = list(element.clauses)
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table = element.tablename
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return (f"({table}.rank_address between 4 and 25"\
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f" AND {table}.type != 'postcode'"\
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f" AND {table}.name is not null"\
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f" AND {table}.linked_place_id is null"\
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f" AND {table}.osm_type = 'N'"\
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" AND MbrIntersects(%s, ST_Expand(%s, 14.0 * exp(-0.2 * %s) - 0.03))"\
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f" AND {table}.place_id IN"\
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" (SELECT place_id FROM placex_place_node_areas"\
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" WHERE ROWID IN (SELECT ROWID FROM SpatialIndex"\
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" WHERE f_table_name = 'placex_place_node_areas'"\
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" AND search_frame = %s)))") % (
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compiler.process(geom1, **kw),
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compiler.process(geom2, **kw),
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compiler.process(rank, **kw),
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compiler.process(geom2, **kw))
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class IsBelowReverseDistance(sa.sql.functions.GenericFunction[Any]):
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name = 'IsBelowReverseDistance'
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inherit_cache = True
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@compiles(IsBelowReverseDistance) # type: ignore[no-untyped-call, misc]
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def default_is_below_reverse_distance(element: IsBelowReverseDistance,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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dist, rank = list(element.clauses)
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return "%s < reverse_place_diameter(%s)" % (compiler.process(dist, **kw),
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compiler.process(rank, **kw))
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@compiles(IsBelowReverseDistance, 'sqlite') # type: ignore[no-untyped-call, misc]
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def sqlite_is_below_reverse_distance(element: IsBelowReverseDistance,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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dist, rank = list(element.clauses)
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return "%s < 14.0 * exp(-0.2 * %s) - 0.03" % (compiler.process(dist, **kw),
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compiler.process(rank, **kw))
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class IsAddressPoint(sa.sql.functions.GenericFunction[Any]):
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name = 'IsAddressPoint'
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inherit_cache = True
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def __init__(self, table: sa.Table) -> None:
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super().__init__(table.c.rank_address,
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table.c.housenumber, table.c.name)
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@compiles(IsAddressPoint) # type: ignore[no-untyped-call, misc]
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def default_is_address_point(element: IsAddressPoint,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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rank, hnr, name = list(element.clauses)
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return "(%s = 30 AND (%s IS NOT NULL OR %s ? 'addr:housename'))" % (
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compiler.process(rank, **kw),
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compiler.process(hnr, **kw),
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compiler.process(name, **kw))
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@compiles(IsAddressPoint, 'sqlite') # type: ignore[no-untyped-call, misc]
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def sqlite_is_address_point(element: IsAddressPoint,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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rank, hnr, name = list(element.clauses)
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return "(%s = 30 AND coalesce(%s, json_extract(%s, '$.addr:housename')) IS NOT NULL)" % (
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compiler.process(rank, **kw),
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compiler.process(hnr, **kw),
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compiler.process(name, **kw))
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class CrosscheckNames(sa.sql.functions.GenericFunction[Any]):
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""" Check if in the given list of names in parameters 1 any of the names
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from the JSON array in parameter 2 are contained.
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"""
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name = 'CrosscheckNames'
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inherit_cache = True
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@compiles(CrosscheckNames) # type: ignore[no-untyped-call, misc]
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def compile_crosscheck_names(element: CrosscheckNames,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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arg1, arg2 = list(element.clauses)
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return "coalesce(avals(%s) && ARRAY(SELECT * FROM json_array_elements_text(%s)), false)" % (
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compiler.process(arg1, **kw), compiler.process(arg2, **kw))
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@compiles(CrosscheckNames, 'sqlite') # type: ignore[no-untyped-call, misc]
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def compile_sqlite_crosscheck_names(element: CrosscheckNames,
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compiler: 'sa.Compiled', **kw: Any) -> str:
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arg1, arg2 = list(element.clauses)
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return "EXISTS(SELECT *"\
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" FROM json_each(%s) as name, json_each(%s) as match_name"\
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" WHERE name.value = match_name.value)"\
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% (compiler.process(arg1, **kw), compiler.process(arg2, **kw))
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class JsonArrayEach(sa.sql.functions.GenericFunction[Any]):
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""" Return elements of a json array as a set.
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"""
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name = 'JsonArrayEach'
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inherit_cache = True
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@compiles(JsonArrayEach) # type: ignore[no-untyped-call, misc]
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def default_json_array_each(element: JsonArrayEach, compiler: 'sa.Compiled', **kw: Any) -> str:
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return "json_array_elements(%s)" % compiler.process(element.clauses, **kw)
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@compiles(JsonArrayEach, 'sqlite') # type: ignore[no-untyped-call, misc]
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def sqlite_json_array_each(element: JsonArrayEach, compiler: 'sa.Compiled', **kw: Any) -> str:
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return "json_each(%s)" % compiler.process(element.clauses, **kw)
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class Greatest(sa.sql.functions.GenericFunction[Any]):
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""" Function to compute maximum of all its input parameters.
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"""
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name = 'greatest'
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inherit_cache = True
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@compiles(Greatest, 'sqlite') # type: ignore[no-untyped-call, misc]
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def sqlite_greatest(element: Greatest, compiler: 'sa.Compiled', **kw: Any) -> str:
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return "max(%s)" % compiler.process(element.clauses, **kw)
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class RegexpWord(sa.sql.functions.GenericFunction[Any]):
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""" Check if a full word is in a given string.
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"""
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name = 'RegexpWord'
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inherit_cache = True
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@compiles(RegexpWord, 'postgresql') # type: ignore[no-untyped-call, misc]
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def postgres_regexp_nocase(element: RegexpWord, compiler: 'sa.Compiled', **kw: Any) -> str:
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arg1, arg2 = list(element.clauses)
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return "%s ~* ('\\m(' || %s || ')\\M')::text" % (compiler.process(arg2, **kw), compiler.process(arg1, **kw))
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@compiles(RegexpWord, 'sqlite') # type: ignore[no-untyped-call, misc]
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def sqlite_regexp_nocase(element: RegexpWord, compiler: 'sa.Compiled', **kw: Any) -> str:
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arg1, arg2 = list(element.clauses)
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return "regexp('\\b(' || %s || ')\\b', %s)" % (compiler.process(arg1, **kw), compiler.process(arg2, **kw))
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