Changes

v1.4.0

• Support managed backups. This includes the API methods for CreateBackup, GetBackup, UpdateBackup, DeleteBackup and others. Also includes a simple wrapper in DatabaseAdminClient to create a backup.
• Update the healthcheck interval. The default interval is updated to 50 mins. By default, the first healthcheck is scheduled between 10 and 55 mins and the subsequent healthchecks are between 45 and 55 mins. This update avoids overloading the backend service with frequent healthchecking.

v1.3.0

• Query options:
  • Adds the support of providing query options (optimizer version) via three ways (precedence follows the order): client-level < environment variables < query-level. The environment variable is set by “SPANNER_OPTIMIZER_VERSION”.
• Connection pooling:
  • Use the new connection pooling in gRPC. This change deprecates ClientConfig.numChannels and users should move to WithGRPCConnectionPool(numChannels) at their earliest convenience. Example:

    // numChannels (deprecated):
    err, client := NewClientWithConfig(ctx, database, ClientConfig{NumChannels: 8})
    
    // gRPC connection pool:
    err, client := NewClientWithConfig(ctx, database, ClientConfig{}, option.WithGRPCConnectionPool(8))
    

• Error handling:
  • Do not rollback after failed commit.
  • Return TransactionOutcomeUnknownError if a DEADLINE_EXCEEDED or CANCELED error occurs while a COMMIT request is in flight.
• spansql:
  • Added support for IN expressions and OFFSET clauses.
  • Fixed parsing of table constraints.
  • Added support for foreign key constraints in ALTER TABLE and CREATE TABLE.
  • Added support for GROUP BY clauses.
• spannertest:
  • Added support for IN expressions and OFFSET clauses.
  • Added support for GROUP BY clauses.
  • Fixed data race in query execution.
  • No longer rejects reads specifying an index to use.
  • Return last commit timestamp as read timestamp when requested.
  • Evaluate add, subtract, multiply, divide, unary negation, unary not, bitwise and/xor/or operations, as well as reporting column types for expressions involving any possible arithmetic operator.arithmetic expressions.
  • Fixed handling of descending primary keys.
• Misc:
  • Change default healthcheck interval to 30 mins to reduce the GetSession calls made to the backend.
  • Add marshal/unmarshal json for nullable types to support NullString, NullInt64, NullFloat64, NullBool, NullTime, NullDate.
  • Use ResourceInfo to extract error.
  • Extract retry info from status.

v1.2.1

• Fix session leakage for ApplyAtLeastOnce. Previously session handles where leaked whenever Commit() returned a non-abort, non-session-not-found error, due to a missing recycle() call.
• Fix error for WriteStruct with pointers. This fixes a specific check for encoding and decoding to pointer types.
• Fix a GRPCStatus issue that returns a Status that has Unknown code if the base error is nil. Now, it always returns a Status based on Code field of current error.

v1.2.0

• Support tracking stacktrace of sessionPool.take() that allows the user to instruct the session pool to keep track of the stacktrace of each goroutine that checks out a session from the pool. This is disabled by default, but it can be enabled by setting SessionPoolConfig.TrackSessionHandles: true.
• Add resource-based routing that includes a step to retrieve the instance-specific endpoint before creating the session client when creating a new spanner client. This is disabled by default, but it can be enabled by setting GOOGLE_CLOUD_SPANNER_ENABLE_RESOURCE_BASED_ROUTING.
• Make logger configurable so that the Spanner client can now be configured to use a specific logger instead of the standard logger.
• Support encoding custom types that point back to supported basic types.
• Allow decoding Spanner values to custom types that point back to supported types.

v1.1.0

• The String() method of NullString, NullTime and NullDate will now return an unquoted string instead of a quoted string. This is a BREAKING CHANGE. If you relied on the old behavior, please use fmt.Sprintf(“%q”, T).
• The Spanner client will now use the new BatchCreateSessions RPC to initialize the session pool. This will improve the startup time of clients that are initialized with a minimum number of sessions greater than zero (i.e. SessionPoolConfig.MinOpened>0).
• Spanner clients that are created with the NewClient method will now default to a minimum of 100 opened sessions in the pool (i.e. SessionPoolConfig.MinOpened=100). This will improve the performance of the first transaction/query that is executed by an application, as a session will normally not have to be created as part of the transaction. Spanner clients that are created with the NewClientWithConfig method are not affected by this change.
• Spanner clients that are created with the NewClient method will now default to a write sessions fraction of 0.2 in the pool (i.e. SessionPoolConfig.WriteSessions=0.2). Spanner clients that are created with the NewClientWithConfig method are not affected by this change.
• The session pool maintenance worker has been improved so it keeps better track of the actual number of sessions needed. It will now less often delete and re-create sessions. This can improve the overall performance of applications with a low transaction rate.

v1.0.0

This is the first tag to carve out spanner as its own module. See: https://github.com/golang/go/wiki/Modules#is-it-possible-to-add-a-module-to-a-multi-module-repository.