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Comment on why we sort the tuples

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This commit is contained in:
Mark Haines 2017-03-09 11:54:22 +00:00
parent 322ee668ce
commit b3db3f19a2
1 changed files with 2 additions and 0 deletions
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src/github.com/matrix-org/dendrite/roomserver/storage/state_block_table.go
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@ -153,6 +153,7 @@ func (s *stateBlockStatements) bulkSelectFilteredStateBlockEntries(
stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple, stateBlockNIDs []types.StateBlockNID, stateKeyTuples []types.StateKeyTuple,
) ([]types.StateEntryList, error) { ) ([]types.StateEntryList, error) {
tuples := stateKeyTupleSorter(stateKeyTuples) tuples := stateKeyTupleSorter(stateKeyTuples)
// Sort the tuples so that we can run binary search against them as we filter the rows returned by the db.
sort.Sort(tuples) sort.Sort(tuples)
eventTypeNIDArray, eventStateKeyNIDArray := tuples.typesAndStateKeysAsArrays() eventTypeNIDArray, eventStateKeyNIDArray := tuples.typesAndStateKeysAsArrays()
@ -185,6 +186,7 @@ func (s *stateBlockStatements) bulkSelectFilteredStateBlockEntries(
entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID) entry.EventStateKeyNID = types.EventStateKeyNID(eventStateKeyNID)
entry.EventNID = types.EventNID(eventNID) entry.EventNID = types.EventNID(eventNID)
// We can use binary search here because we sorted the tuples earlier
if !tuples.contains(entry.StateKeyTuple) { if !tuples.contains(entry.StateKeyTuple) {
// The select will return the cross product of types and state keys. // The select will return the cross product of types and state keys.
// So we need to check if type of the entry is in the list. // So we need to check if type of the entry is in the list.