This looks like expected behavior to me. You aren't inserting a value for
b. Since there's no value, there's also no writetime.
On Tue, Jul 18, 2017 at 12:15 PM Nitan Kainth <ni...@bamlabs.com> wrote:
> Hi,
>
> We see that null columns have writetime(column) populated for few columns
> and shows null for few other. Is it any bug or something else?
>
>
> CREATE KEYSPACE test WITH replication = {'class':
> 'NetworkTopologyStrategy', 'us-east': '2'} AND durable_writes = true;
>
> CREATE TABLE test.t (
> a text PRIMARY KEY,
> b text
> ) WITH bloom_filter_fp_chance = 0.01
> AND caching = {'keys': 'ALL', 'rows_per_partition': 'NONE'}
> AND comment = ''
> AND compaction = {'class':
> 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy',
> 'max_threshold': '32', 'min_threshold': '4'}
> AND compression = {'chunk_length_in_kb': '64', 'class':
> 'org.apache.cassandra.io.compress.LZ4Compressor'}
> AND crc_check_chance = 1.0
> AND dclocal_read_repair_chance = 0.1
> AND default_time_to_live = 0
> AND gc_grace_seconds = 864000
> AND max_index_interval = 2048
> AND memtable_flush_period_in_ms = 0
> AND min_index_interval = 128
> AND read_repair_chance = 0.0
> AND speculative_retry = '99PERCENTILE’;
>
> insert into test.t (a ) values ('z’);
> insert into test.t (a ) values ('w’);
> insert into test.t (a ) values ('e’);
> insert into test.t (a ) values ('r’);
> insert into test.t (a ) values ('t’);
>
> select a,b, writetime (b) from test.t ;
>
> *a* | *b* | *writetime(b)*
> ---+------+------------------
> *z* | *null* | *null*
> *a* | *null* | *null*
> *c* | *null* | *null*
> *e* | *null* | *null*
> *r* | *null* | *null*
> *d* | *null* | *1500400745074499*
> *w* | *null* | *1500400745074499*
> *v* | *null* | *1500400745074499*
> *t* | *null* | *1500400745074499*
> *x* | *y* | *1500400626266371*
>
