cql3

问题 activity | timestamp | source | source_elapsed ------------------------------------------------------------------------------------------------------+--------------+---------------+---------------- execute_cql3_query | 06:30:52,479 | 192.168.11.23 | 0 Parsing select adid from userlastadevents where userid = '90000012' and type in (1,2,3) LIMIT 10000; | 06:30:52,479 | 192.168.11.23 | 44 Peparing statement | 06:30:52,479 | 192.168.11.23 | 146 Executing single-partition query on userlastadevents

问题 I want to create a table with wide partitions (or, put another way, a table which has no value columns (non primary key columns)) that enables the number of rows in any of its partitions to be efficiently procured. Here is a simple definition of such a table CREATE TABLE IF NOT EXISTS test_table ( partitionKeyCol timestamp clusteringCol timeuuid partitionRowCountCol counter static PRIMARY KEY (partitionKeyCol, clusteringCol) ) The problem with this definition, and others structured like it,

问题 I want to create a table with wide partitions (or, put another way, a table which has no value columns (non primary key columns)) that enables the number of rows in any of its partitions to be efficiently procured. Here is a simple definition of such a table CREATE TABLE IF NOT EXISTS test_table ( partitionKeyCol timestamp clusteringCol timeuuid partitionRowCountCol counter static PRIMARY KEY (partitionKeyCol, clusteringCol) ) The problem with this definition, and others structured like it,

问题 I am new to CQL and trying to add pagination support for my tables defined in cassandra as shown below - cqlsh:dev> create table emp4 (empid uuid , year varchar , month varchar , day varchar, primary key((year, month, day), empid)); cqlsh:dev> insert into emp4 (empid, year, month, day) values (08f823ac-4dd2-11e5-8ad6-0c4de9ac7563,'2014','03','19'); cqlsh:dev> insert into emp4 (empid, year, month, day) values (08f823ac-4dd2-11e5-8ad6-0c4de9ac7562,'2016','03','19'); cqlsh:dev> select * from

问题 I am new to CQL and trying to add pagination support for my tables defined in cassandra as shown below - cqlsh:dev> create table emp4 (empid uuid , year varchar , month varchar , day varchar, primary key((year, month, day), empid)); cqlsh:dev> insert into emp4 (empid, year, month, day) values (08f823ac-4dd2-11e5-8ad6-0c4de9ac7563,'2014','03','19'); cqlsh:dev> insert into emp4 (empid, year, month, day) values (08f823ac-4dd2-11e5-8ad6-0c4de9ac7562,'2016','03','19'); cqlsh:dev> select * from

问题 I've a cassandra table definition as following CREATE TABLE mytable ( colA text, colB text, timeCol timestamp, colC text, PRIMARY KEY ((colA, colB, timeCol), colC) ) WITH.... I want to know if number of tombstones would vary between following types of queries: 1. delete from mytable where colA = '...' AND colB = '...' and timeCol = 111 Above query affect multiple records, (multiple values of colC) 2. delete from mytable where colA = '...' AND colB = '...' and timeCol = 111 AND colC = '...'

问题 Lets assume I have a Column Family with following schema: CREATE TABLE users ( user_id timeuuid, name varchar, last_name varchar, children list, phone_numbers map, PRIMARY KEY(user_id) ); Then I insert a row into this CF with "USING TTL 60000". When I want to verify if any of these columns still has TTL set I get error: "Cannot use selection function ttl on collections". My question is: how to get TTL on elements of a column that is defined as collection ? Cheers! 回答1: I reproduced your

问题 I'm loading some simple data from Cassandra into Pig using CqlStorage . The CqlStorage loader defines a schema based on the Cassandra schema, but it seems to be wrong. If I do: data = LOAD 'cql://bookdata/books' USING CqlStorage(); DESCRIBE data; I get this: data: {isbn: chararray,bookauthor: chararray,booktitle: chararray,publisher: chararray,yearofpublication: int} However, if I DUMP data , I get results like these: ((isbn,0425093387),(bookauthor,Georgette Heyer),(booktitle,Death in the

问题 This seems to be a mystery in cassandra, According to official documentation, one can create index on a column by using a custom indexer class CREATE CUSTOM INDEX ON users (email) USING 'path.to.the.IndexClass'; But I could not find any documentation regarding the interface/class to be implemented/extended to do this and how to configure cassandra to find the class? I wanted to write a custom indexer which could skip indexing rows based on conditions/options. 回答1: Here what I've found https:/

问题 This may sound silly as there are no null values in SQL's composite primary key. But just want to confirm if we can have the same in CQL3? So, we have a table like this to store wide rows: CREATE TABLE keyspace12.colFamily1 ( id text, colname text, colvalue blob, PRIMARY KEY (id,colname, colvalue) ) WITH COMPACT STORAGE And we have some cases where colname is null. Can I do that? If yes, then how? If NO, then what are the ways to store wide columns rows where we can have some null in first