如何在cassandra中查看动态CF的列名？

Question

我正在尝试获取我的列族的列名，这些列名是动态创建的。

我创建了CF

[default@test] CREATE COLUMN FAMILY blog_entry
WITH comparator = TimeUUIDType
AND key_validation_class=UTF8Type
AND default_validation_class = UTF8Type;

[default@test] show schema;

create column family blog_entry
  with column_type = 'Standard'
  and comparator = 'TimeUUIDType'
  and default_validation_class = 'UTF8Type'
  and key_validation_class = 'UTF8Type'
  and read_repair_chance = 0.1
  and dclocal_read_repair_chance = 0.0
  and populate_io_cache_on_flush = false
  and gc_grace = 864000
  and min_compaction_threshold = 4
  and max_compaction_threshold = 32
  and replicate_on_write = true
  and compaction_strategy = 'org.apache.cassandra.db.compaction.SizeTieredCompactionStrategy'
  and caching = 'KEYS_ONLY'
  and compression_options = {'sstable_compression' : 'org.apache.cassandra.io.compress.SnappyCompressor'};

我用列名插入了一些数据，但是现在如何查看我的列名呢？

Answer 1

您必须逐行查询，才能看到列元数据中没有声明的任何列名。如果要向列元数据中添加列，则需要更改列族定义。卡桑德拉不会自动为你这么做的。