Improve the driver's interactions with SHOW PROCESSLIST and KILL.

[reltuk]

No description provided.

[Copilot]

Pull request overview

This PR improves the embedded driver’s integration with go-mysql-server’s ProcessList so that SHOW PROCESSLIST and KILL QUERY behave more like the server path, including creating a per-query context and ensuring query lifecycle transitions are reflected correctly.

Changes:

• Introduces per-query contexts (with unique PIDs) and wires query begin/end to the engine ProcessList.
• Updates row-set closing behavior to end queries when Rows.Close() is called.
• Refactors smoke test DB initialization/cleanup and adds a new smoke test covering SHOW PROCESSLIST and KILL QUERY.

Reviewed changes

Copilot reviewed 5 out of 5 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
conn.go	Adds per-query context creation (beginQuery) / cleanup (endQuery) and removes connections from ProcessList on close.
connector.go	Builds a session/context that registers connections with the engine ProcessList.
statement.go	Routes statement execution through DoltConn.beginQuery and uses per-query contexts for engine calls.
rows.go	Ends the active query in the process list when rows are closed.
smoke_test.go	Refactors test DB setup/cleanup, switches many tests to t.Context(), and adds a SHOW PROCESSLIST / KILL QUERY smoke test.

Comments suppressed due to low confidence (1)

conn.go:52

• Prepare updates d.gmsCtx's QueryTime, but queries now execute against the per-query queryCtx created in beginQuery. That means QueryTime updates on d.gmsCtx will no longer affect functions that read ctx.QueryTime (e.g., NOW()) when a ProcessList is present. Consider setting QueryTime on freshCtx/queryCtx inside beginQuery (and updating the comment in Prepare, since the context is no longer reused for execution).

// Prepare packages up |query| as a *doltStmt so it can be executed. If multistatements mode
// has been enabled, then a *doltMultiStmt will be returned, capable of executing multiple statements.
func (d *DoltConn) Prepare(query string) (driver.Stmt, error) {
	// Reuse the same ctx instance, but update the QueryTime to the current time.
	// Statements are executed serially on a connection, so it's safe to reuse
	// the same ctx instance and update the time.
	d.gmsCtx.SetQueryTime(time.Now())

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[coffeegoddd]

A few questions/comments.

[Copilot]

Pull request overview

Copilot reviewed 13 out of 13 changed files in this pull request and generated 9 comments.

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