604e99396d
Commit b89e151054a05f0f6d356ca52e3b725dd0505e53 added the ResolveCminCmaxDuringDecoding declaration to tqual.h, which uses an HTAB parameter, without declaring HTAB. It accidentally fails to fail to build with current sources because a declaration happens to be included, directly or indirectly, in all source files that currently use tqual.h before tqual.h is first included, but we shouldn't count on that. Since an opaque declaration is enough here, just use that, as was done in snapmgr.h. Backpatch to 9.4, where the HTAB reference was added to tqual.h.
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