Disable optimize_rewrite_sum_if_to_count_if if return type is nullable (new analyzer)

[antonio2368]

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https://s3.amazonaws.com/clickhouse-test-reports/0/0b97f3ac16507cd72ed4e33739d355d16a48a741/ast_fuzzer__tsan_.html

In old analyzer it was disabled because toNullable is a function and not ASTLiteral.

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• Documentation is written (mandatory for new features)

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[Algunenano]

This reminds me of f0354ee.

Both bugs are introduced because getValue() ignores nullability.

Probably constant_value_literal.getType() should be changed to literal->getResultType(), and getType() should be refactored to something with a completely different name to avoid this confusion again as getResultType() and getType() and pretty much identical and getType() does unexpected things. Thoughts?

[antonio2368]

yes it was confusing at first when reading the code because you don't pay attention to the fact that the Nullability info is lost when you get Field
not sure what would be the best solution

[robot-ch-test-poll3]

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