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merge_test.go

merge_test.go - Overview​

This file contains tests for the merge operator functionality in BadgerDB. It tests various scenarios including adding values, retrieving merged values, handling deletions, and ensuring proper compaction behavior with merge operators.

Detailed Documentation​

TestGetMergeOperator(t *testing.T)​

Purpose: This function tests the GetMergeOperator functionality with different scenarios.

  • t: *testing.T - Testing object.

t.Run("Get before Add", ...)​

Purpose: Tests the scenario where Get is called on a merge operator before any values are added.

t.Run("Add and Get", ...)​

Purpose: Tests the scenario where values are added to the merge operator, and then Get is called to retrieve the merged value.

t.Run("Add and Get slices", ...)​

Purpose: Tests the scenario where byte slices are added to the merge operator and concatenated using a custom merge function.

t.Run("Get Before Compact", ...)​

Purpose: Tests the scenario where values are added to the merge operator, Get is called, and then compaction occurs.

t.Run("Get after Delete", ...)​

Purpose: Tests the scenario where values are added, merged, the key is deleted, and then new values are added and retrieved.

t.Run("Get after Stop", ...)​

Purpose: Tests the scenario where values are added to the merge operator, Stop is called and then Get is called to retrieve the merged value.

t.Run("Old keys should be removed after compaction", ...)​

Purpose: Tests if old keys are removed after compaction.

uint64ToBytes(i uint64) []byte​

Purpose: Converts a uint64 to a byte slice using big-endian encoding.

  • i: uint64 - The unsigned 64-bit integer to convert.
  • Returns: []byte - The byte slice representation of the integer.

bytesToUint64(b []byte) uint64​

Purpose: Converts a byte slice to a uint64 using big-endian encoding.

  • b: []byte - The byte slice to convert.
  • Returns: uint64 - The unsigned 64-bit integer representation of the byte slice.

add(existing, latest []byte) []byte​

Purpose: Merge function to add two uint64 numbers represented as byte slices.

  • existing: []byte - The existing value as a byte slice.
  • latest: []byte - The latest value as a byte slice.
  • Returns: []byte - The sum of the two values, as a byte slice.

Getting Started Relevance​