change the auto_increment field filter to only allow the first field in the primary key or the first field in the row if there is no primary key. closes #738

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get covering index reads to work by supplying the key from the index to the read row function. addresses #705

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add comments for read_row

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add comments for several member variables

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allow one to turn transactions, locking, or logging off in the tokudb storage engine for experiments. addresses #460

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add comments to most member variables in ha_tokudb.cc
change initialization of cursor and transaction pointers to NULL instead of 0


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put comments above public function declaring what their behavior, parameters
and possible return values

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Save comparison function in handlerton
Currently supports all pure integer types



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show engine tokudb logs always reports nothing.  the tokudb log_archhive function always returns EINVAL since it does not support flags!=0.  set log_archive flags=0 for tokudb to avoid EINVAL return.  addresses #697



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dereferencing value in debug statement that could be NULL
this fixes it.

git-svn-id: file:///svn/mysql/tokudb-engine/src@3276 c7de825b-a66e-492c-adef-691d508d4ae1

Updated ha_tokudb::index_read and comparison functions based on code review.
Also put in some (very informal) comments about how index_read is supposed to work.

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fix the EDOM errors by makeing the key compare function implement a total order on the key space (including key prefixes), and using DB_SET_RANGE in place of DB_SET for cursor operations.  closes #576 closes #587



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file->offset(addr) were assuming addr was within the field's record, which is not always the case.  closes #592

git-svn-id: file:///svn/mysql/tokudb-engine/src@3058 c7de825b-a66e-492c-adef-691d508d4ae1

from the last auto increment number.  this makes insertions of multiple rows
work.



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