Comments (1)
lcwangchao
commented on August 17, 2024
IndexJoin 和 IndexHashJoin 的实现很相似，他们都会读取外表数据并生成若干 task。每个 task 会根据外表数据算出 range 来读取内表数据来做 join。区别在于，IndexJoin 会将每个 task 中查出来的内表数据生成哈希表，使用外表数据来匹配内表数据。而 IndexHashJoin 正相反，在每个 task 中会将外表数据生成哈希表，并使用内表数据来匹配。由于每个 task 中外表数据行数是相对固定的，IndexHashJoin 生成的哈希表大小也相对固定，这在某些场景下对内存更加友好一点。
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