Moved sql and test files

test/sql/btree.sql

@@ -0,0 +1,12 @@
+SET client_min_messages = warning;
+CREATE EXTENSION IF NOT EXISTS vector;
+SET enable_seqscan = off;
+
+CREATE TABLE t (val vector(3));
+INSERT INTO t (val) VALUES ('[0,0,0]'), ('[1,2,3]'), ('[1,1,1]'), (NULL);
+CREATE INDEX ON t (val);
+
+SELECT * FROM t WHERE val = '[1,2,3]';
+SELECT * FROM t ORDER BY val LIMIT 1;
+
+DROP TABLE t;