Fix missing ann_exception.h in index_build_params.h #685
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Reference Issues/PRs
What does this implement/fix? Briefly explain your changes.
In include/index_build_params.h, the reference to ANNException class relies on the header file include/ann_exception.h. The current build didn't fail maybe because other files include that ann_exception.h header but that was dangerous: it's not guaranteed that the ann_exception.h will always be included by other files in future builds. I suggest we explicitly include the ann_exception.h header whenever we need it.
Any other comments?