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This is part of pre work for analyzing push down. This PR implements a distsql request for analyze, and a special NextRaw for the use of analyze.
PTAL @coocood @hanfei1991 @winoros
distsql: implement a special coprocessor iterator for analyze
Have you considered to reuse the old iterator by modifying it?
We can add NextRaw on SelectResult, and change resultWithErr.result type to byte.
unmarshal to PartialResult only on Next method, return the raw byte on NextRaw.
remove unnecessary error trace
Merge branch 'master' into xhb/predist
Merge branch 'xhb/predist' of github.com:pingcap/tidb into xhb/predist
@zimulala PTAL again, Thanks.