[DISCUSS] Add column operations in Table API

Hi, ALL: Currently, there are already lots of table-level operations available in Table API such as the select, window, join, etc. Most functionalities can be accomplished with these APIs. But things may become difficult when there are too many columns to operate. The difficulties can be

[jira] [Created] (FLINK-11871) Introduce LongHashTable to improve performance when join key fits in long

Kurt Young created FLINK-11871: -- Summary: Introduce LongHashTable to improve performance when join key fits in long Key: FLINK-11871 URL: https://issues.apache.org/jira/browse/FLINK-11871 Project: Flink