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adding condition to avoid self-comparison in neighbor queries

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This commit is contained in:
Andy Eschbacher 2016-03-30 15:37:51 -04:00
parent 22b6aed7c1
commit ea02f36235
2 changed files with 21 additions and 15 deletions
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11
src/py/crankshaft/crankshaft/pysal_utils/pysal_utils.py
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@ -89,9 +89,11 @@ def knn(params):
"%(attr_select)s" \
"(SELECT ARRAY(SELECT j.\"{id_col}\" " \
"FROM ({subquery}) As j " \
"WHERE %(attr_where_j)s AND " \
"i.\"{id_col}\" <> j.\"{id_col}\" " \
"ORDER BY j.\"{geom_col}\" <-> i.\"{geom_col}\" ASC " \
"WHERE " \
"i.\"{id_col}\" <> j.\"{id_col}\" AND " \
"%(attr_where_j)s " \
"ORDER BY " \
"j.\"{geom_col}\" <-> i.\"{geom_col}\" ASC " \
"LIMIT {num_ngbrs})" \
") As neighbors " \
"FROM ({subquery}) As i " \
@ -118,7 +120,8 @@ def queen(params):
"%(attr_select)s" \
"(SELECT ARRAY(SELECT j.\"{id_col}\" " \
"FROM ({subquery}) As j " \
"WHERE ST_Touches(i.\"{geom_col}\", j.\"{geom_col}\") AND " \
"WHERE i.\"{id_col}\" <> j.\"{id_col}\" AND " \
"ST_Touches(i.\"{geom_col}\", j.\"{geom_col}\") AND " \
"%(attr_where_j)s)" \
") As neighbors " \
"FROM ({subquery}) As i " \

11
src/py/crankshaft/test/test_pysal_utils.py
View File

@ -40,10 +40,11 @@ class PysalUtilsTest(unittest.TestCase):
"i.\"jay_z\"::numeric As attr2, " \
"(SELECT ARRAY(SELECT j.\"cartodb_id\" " \
"FROM (SELECT * FROM a_list) As j " \
"WHERE j.\"andy\" IS NOT NULL AND " \
"WHERE " \
"i.\"cartodb_id\" <> j.\"cartodb_id\" AND " \
"j.\"andy\" IS NOT NULL AND " \
"j.\"jay_z\" IS NOT NULL AND " \
"j.\"jay_z\" <> 0 AND " \
"i.\"cartodb_id\" <> j.\"cartodb_id\" " \
"j.\"jay_z\" <> 0 " \
"ORDER BY " \
"j.\"the_geom\" <-> i.\"the_geom\" ASC " \
"LIMIT 321)) As neighbors " \
@ -63,7 +64,9 @@ class PysalUtilsTest(unittest.TestCase):
"i.\"jay_z\"::numeric As attr2, " \
"(SELECT ARRAY(SELECT j.\"cartodb_id\" " \
"FROM (SELECT * FROM a_list) As j " \
"WHERE ST_Touches(i.\"the_geom\", " \
"WHERE " \
"i.\"cartodb_id\" <> j.\"cartodb_id\" AND " \
"ST_Touches(i.\"the_geom\", " \
"j.\"the_geom\") AND " \
"j.\"andy\" IS NOT NULL AND " \
"j.\"jay_z\" IS NOT NULL AND " \