Last commit made on 2019-05-20
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b4696ee... by varun on 2019-05-20

MDEV-15777: Support Early NULLs filtering-like restrictions in the range optimizer

For eqjoin conditions, we add a NOT NULL predicate so as to allow the range optimizer
to use the predicate and possibly create a range access on the given table.

  select * from t1,t2 where t1.a=t2.a; we have KEY(a) on t1
  we would inject a NOT NULL predicate t1.a IS NOT NULL for table t1
  this would allow the range optimizer to create ranges and we get a
  range access on table t1, then we will be able
  to do an early NULL filtering for ranges too.

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