单选题
A It is effective only in partition pruning.
B It is effective only in partitionwise joins provided that the query predicates are different from the partitioning key.
C It is effective in both partition pruning as well as partitionwise joins provided that the query predicates are identical to the partitioning key.
D It is effective in both partition pruning as well as partitionwise joins irrespective of whether the query predicates are different from or identical to the partitioning key.
正确答案
答案解析
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