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From Jonathan Haddad <...@jonhaddad.com>
Subject Re: write time for nulls is not consistent
Date Tue, 18 Jul 2017 19:22:24 GMT
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 <nitan@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*
>

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