adding pgsql tests

src/pg/test/expected/16_getis_test.out

@@ -0,0 +1,23 @@
+\pset format unaligned
+\set ECHO all
+\i test/fixtures/ppoints.sql
+SET client_min_messages TO WARNING;
+\set ECHO none
+_cdb_random_seeds
+
+(1 row)
+z_score|p_value
+-1.0358|0.0160
+-0.6404|0.0070
+2.6802|0.0190
+4.7529|0.0020
+2.7270|0.0250
+-1.2444|0.0230
+4.6322|0.0150
+4.5325|0.0220
+-1.3115|0.0090
+-1.3115|0.0080
+4.6361|0.0010
+2.8307|0.0310
+-1.3115|0.0020
+(13 rows)

src/pg/test/sql/16_getis_test.sql

@@ -0,0 +1,13 @@
+\pset format unaligned
+\set ECHO all
+\i test/fixtures/getis_data.sql
+
+-- set random seed
+SELECT cdb_crankshaft._cdb_random_seeds(1234);
+
+-- test against PySAL example dataset
+SELECT z_score, p_val
+FROM cdb_crankshaft.CDB_GetisOrdsG(
+  'select * from ppoints2',
+  'ratio') As cdb_getisordsg(z_score, p_val, p_z_sim)
+WHERE p_val <= 0.05;