Alexey Kopytov
f6868a4eb4
Bug #47123 : Endless 100% CPU loop with STRAIGHT_JOIN ...
The problem was in incorrect handling of predicates involving
NULL as a constant value by the range optimizer.
For example, when creating a SEL_ARG node from a condition of
the form "field < const" (which would normally result in the
"NULL < field < const" SEL_ARG), the special case when "const"
is NULL was not taken into account, so "NULL < field < NULL"
was produced for the "field < NULL" condition.
As a result, SEL_ARG structures of this form could not be
further optimized which in turn could lead to incorrectly
constructed SEL_ARG trees. In particular, code assuming SEL_ARG
structures to always form a sequence of ordered disjoint
intervals could enter an infinite loop under some
circumstances.
Fixed by changing get_mm_leaf() so that for any sargable
predicate except "<=>" involving NULL as a constant, "empty"
SEL_ARG is returned, since such a predicate is always false.
mysql-test/r/partition_pruning.result:
Fixed a broken test case.
mysql-test/r/range.result:
Added a test case for bug #47123 .
mysql-test/r/subselect.result:
Fixed a broken test cases.
mysql-test/t/range.test:
Added a test case for bug #47123 .
sql/opt_range.cc:
Fixed get_mm_leaf() so that for any sargable
predicate except "<=>" involving NULL as a constant, "empty"
SEL_ARG is returned, since such a predicate is always false.
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