Identify system-versioned columns in the InnoDB dictionary

Both bits DATA_VERSIONED will be set in prtype if the column
is system-versioned. The bits will be 0 for normal unversioned
columns. For the special columns identifying the logical start
and end times of versions, only one bit will be set:
DATA_VERS_START or DATA_VERS_END.

create_table_info_t::create_table_def(),
prepare_inplace_alter_table_dict(): Set prtype |= DATA_VERSIONED
for system-versioned columns.

dfield_t::is_version_historical_end(): Determine if a data tuple
field is_version_end() and contains a timestamp in the past
(not TRX_ID_MAX).

dtype_t, dict_col_t: Add the accessors
is_versioned(), is_version_start(), is_version_end().

trx_id_max_bytes[]: The bit pattern of TRX_ID_MAX, for use with
memcmp().

1 files changed, 0 insertions, 14 deletions

diff --git a/storage/innobase/data/data0data.cc b/storage/innobase/data/data0data.cc
index fbdb409dbc5..6601edfec9d 100644
--- a/storage/innobase/data/data0data.cc
+++ b/storage/innobase/data/data0data.cc
@@ -861,17 +861,3 @@ dfield_t::clone(mem_heap_t* heap) const
 
 	return(obj);
 }
-
-/** Assuming field is sys_trx_end checks whether its value is not SYS_TRX_MAX.
-@param	dfield	field to check
-@return true for historical rows and false otherwise*/
-bool
-dfield_is_historical_sys_trx_end(const dfield_t* dfield)
-{
-	static const trx_id_t MAX = TRX_ID_MAX;
-	ut_ad(dfield);
-	ut_ad(dfield->type.prtype & DATA_VERS_END);
-	const byte* data = static_cast<const byte*>(dfield_get_data(dfield));
-	ut_ad(dfield_get_len(dfield) == 8);
-	return(memcmp(data, &MAX, 8));
-}