Tests for BUG PGPRO-818

This simple tests for btree index and hash index creating and changing column size

Author: Mikhail Samoylov

src/test/regress/expected/alter_table.out

@@ -3016,3 +3016,15 @@ Table "public.test_add_column"
  c4     | integer | 
 
 DROP TABLE test_add_column;
+
+CREATE TABLE test (test_column CHARACTER VARYING(128));
+CREATE INDEX test_index ON test USING btree(upper(test_column));
+ALTER TABLE test ALTER COLUMN test_column TYPE VARCHAR(2048);
+DROP TABLE test;
+
+CREATE TABLE test (test_column CHARACTER VARYING(128));
+CREATE INDEX test_index ON test USING HASH(upper(test_column));
+WARNING:  hash indexes are not WAL-logged and their use is discouraged
+ALTER TABLE test ALTER COLUMN test_column TYPE VARCHAR(2048);
+WARNING:  hash indexes are not WAL-logged and their use is discouraged
+DROP TABLE test;

src/test/regress/sql/alter_table.sql

@@ -1912,3 +1912,18 @@ ALTER TABLE test_add_column
 	ADD COLUMN c4 integer;
 \d test_add_column
 DROP TABLE test_add_column;
+
+-- test CHANGE COLUMN SIZE WITH BTREE INDEX
+CREATE TABLE test (test_column CHARACTER VARYING(128));
+CREATE INDEX test_index ON test USING btree(upper(test_column);
+ALTER TABLE test ALTER COLUMN test_column TYPE VARCHAR(2048);
+DROP TABLE test;
+
+-- test CHANGE COLUMN SIZE WITH HASH INDEX
+CREATE TABLE test (test_column CHARACTER VARYING(128));
+CREATE INDEX test_index ON test USING HASH(upper(test_column));
+ALTER TABLE test ALTER COLUMN test_column TYPE VARCHAR(2048);
+DROP TABLE test;
+
+
+