我最近在三節點MapR羣集上安裝了Impala。當我運行一個簡單的查詢時,性能不如Impala + HDFS。以下是查詢: SELECT *
FROM ft_test, ft_wafer
WHERE ft_test_parquet.id = ft_wafer_parquet.id
and month = 1
and day = 8
and param = 2913;
花了大約3秒。但
我的情況與下面討論的示例幾乎相同。 select data where date is max(date) less than x 我有表作爲 s_currency cdate ratio currency
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2017