add test

dbms/tests/queries/0_stateless/00754_alter_modify_column_partitions.reference

+*** Check SHOW CREATE TABLE ***
+CREATE TABLE test.alter_column (`x` UInt32, `y` Int32) ENGINE = MergeTree PARTITION BY x ORDER BY x SETTINGS index_granularity = 8192
+*** Check parts ***
+0	0
+10	-10
+11	-11
+12	-12
+13	-13
+14	-14
+15	-15
+16	-16
+17	-17
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+1	-1
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+97	-97
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+99	-99
+9	-9
+*** Check SHOW CREATE TABLE after ALTER MODIFY ***
+CREATE TABLE test.alter_column (`x` UInt32, `y` Int64) ENGINE = MergeTree PARTITION BY x ORDER BY x SETTINGS index_granularity = 8192
+*** Check parts after ALTER MODIFY ***
+0	0
+10	-10
+11	-11
+12	-12
+13	-13
+14	-14
+15	-15
+16	-16
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+1	-1
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+97	-97
+98	-98
+99	-99
+9	-9

dbms/tests/queries/0_stateless/00754_alter_modify_column_partitions.sql

+-- check ALTER MODIFY COLUMN with partitions
+
+SET send_logs_level = 'none';
+
+DROP TABLE IF EXISTS test.alter_column;
+
+CREATE TABLE test.alter_column(x UInt32, y Int32) ENGINE MergeTree PARTITION BY x ORDER BY x;
+INSERT INTO test.alter_column (x, y) SELECT number AS x, -number AS y FROM system.numbers LIMIT 100;
+
+SELECT '*** Check SHOW CREATE TABLE ***';
+SHOW CREATE TABLE test.alter_column;
+
+SELECT '*** Check parts ***';
+SELECT * FROM test.alter_column ORDER BY _part;
+
+ALTER TABLE test.alter_column MODIFY COLUMN y Int64;
+
+SELECT '*** Check SHOW CREATE TABLE after ALTER MODIFY ***';
+SHOW CREATE TABLE test.alter_column;
+
+SELECT '*** Check parts after ALTER MODIFY ***';
+SELECT * FROM test.alter_column ORDER BY _part;
+
+DROP TABLE test.alter_column;