列名 cassandra 中的连字符

Question

我创建了一个 table，其中一列带有 hypen

create table word ( name text,"all-category" text,primary key(name));

我可以成功做到这一点

desc schema; 
CREATE KEYSPACE demo WITH replication = {'class': 'SimpleStrategy', 'replication_factor': '1'}  AND durable_writes = true;

CREATE TABLE demo.word (
name text PRIMARY KEY,
"all-category" 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';

但现在当我尝试使用此列进行查询时，如下所示

SELECT * FROM word where "all-category" = 'FOOD';

我收到这个错误

InvalidRequest: code=2200 [Invalid query] message="No supported secondary index found for the non primary key columns restrictions"

这种情况下如何查询？

Answer 1

为了从 cassandra 的列族中查询数据，where 条件中的列应该是主键，或者您必须在该列上创建索引。

要使查询生效，您必须在该字段上创建索引

create index idx_category on word ("all-category")

创建上述索引后，您的上述查询将起作用。尽管在 cassandra 中应该避免二级索引。

列名 cassandra 中的连字符

Hyphen in column name cassandra

cassandra

cql3

cqlsh

cassandra-3.0