should be it

external/duckdb/test/sql/attach/attach_new_compression.test

@@ -0,0 +1,68 @@
+# name: test/sql/attach/attach_new_compression.test
+# description: Tests attaching database files and using new compression methods
+# group: [attach]
+
+statement ok
+PRAGMA enable_verification
+
+statement ok
+ATTACH '__TEST_DIR__/test_new_compression.db' AS db1 (STORAGE_VERSION 'v1.0.0');
+
+statement ok
+SET force_compression='roaring'
+
+statement ok
+CREATE TABLE db1.tbl AS SELECT CASE WHEN i%2=0 THEN NULL ELSE i END i FROM range(10000) t(i);
+
+statement ok
+SET force_compression='zstd';
+
+statement ok
+CREATE TABLE db1.str_tbl AS SELECT STRING_AGG('long_string_' || i, '-') FROM range(1000) t(i);
+
+# verify new compression methods are not used when attaching with a low storage version
+query I
+SELECT COUNT(*)>0 FROM pragma_storage_info('db1.tbl') WHERE compression='Roaring'
+----
+false
+
+query I
+SELECT COUNT(*)>0 FROM pragma_storage_info('db1.str_tbl') WHERE compression='ZSTD'
+----
+false
+
+statement ok
+DETACH db1
+
+# attach with a new storage version and re-write the table
+statement ok
+ATTACH '__TEST_DIR__/test_new_compression.db' AS db1 (STORAGE_VERSION 'v1.2.0');
+
+statement ok
+SET force_compression='roaring'
+
+statement ok
+CREATE TABLE db1.tbl2 AS FROM db1.tbl
+
+statement ok
+CHECKPOINT db1
+
+statement ok
+SET force_compression='zstd';
+
+statement ok
+CREATE TABLE db1.str_tbl2 AS FROM db1.str_tbl
+
+statement ok
+CHECKPOINT db1
+
+# roaring is used now
+query I
+SELECT COUNT(*)>0 FROM pragma_storage_info('db1.tbl2') WHERE compression='Roaring'
+----
+true
+
+query I
+SELECT COUNT(*)>0 FROM pragma_storage_info('db1.str_tbl2') WHERE compression='ZSTD'
+----
+true