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8 check-ins related to "omit-column-cache"

Remove the column-cache from the code generator. The column-cache has been a persistent source of bugs for years and with recent improvements in the performance of OP_Column, it no longer provides a benefit. After the column cache is removed, the binary is almost 2KB smaller and the speed-check.sh performance test is over 3 million cycles faster. check-in: cdff3af7 user: drh tags: trunk
Remove a testcase() that is no longer reachable without the column cache. Provide an assert() to help prove that the testcase is no longer reachable. Closed-Leaf check-in: a500893b user: drh tags: omit-column-cache
Fix comments that were made obsolete by the removal of the column cache. check-in: 2041231d user: drh tags: omit-column-cache
Remove more column-cache residue: The OP_SetColTab and OP_VerifyColTab opcodes and the associated SQLITE_DEBUG_COLUMNCACHE logic. check-in: 80236e81 user: drh tags: omit-column-cache
Further logic simplifications that flow out of the omission of the column cache. check-in: 7d9072b0 user: drh tags: omit-column-cache
Remove additional traces of the column cache. check-in: db6052e9 user: drh tags: omit-column-cache
Completely remove the column cache logic, which has been a persistent source of bugs for many years. Due to recent enhancements to the performance of the OP_Column opcode, removing the column cache actually makes speed-check.sh run faster. Removing the column cache also saves about 1,800 bytes of code space. check-in: 3f5f60cd user: drh tags: omit-column-cache
Fix the handling of sub-queries with LIMIT clauses by the optimization activated by compile-time symbol SQLITE_COUNTOFVIEW_OPTIMIZATION. check-in: 21235d9a user: dan tags: trunk