clisqlshell: hide debug mode behind --debug-sql-cli

Release note (cli change): The interactive SQL shell now supports an
advanced debug mode for troubleshooting when `--debug-sql-cli` is
specified on the command line. The debug mode can be enabled with
Ctrl+@ or Ctrl+_ (Ctrl+space on macOS).

pkg/cli/clisqlshell/editor.go

@@ -29,6 +29,7 @@ type editor interface {
 }
 
 type sqlShell interface {
+	enableDebug() bool
 	inCopy() bool
 	runShowCompletions(sql string, offset int) (rows [][]string, err error)
 	serverSideParse(sql string) (string, error)

pkg/cli/clisqlshell/editor_bubbline.go

@@ -35,7 +35,9 @@ func (b *bubblineReader) init(
 	cleanupFn = func() { b.ins.Close() }
 
 	b.ins.MaxHistorySize = maxHistEntries
-	b.ins.SetDebugEnabled(true)
+	if sqlS.enableDebug() {
+		b.ins.SetDebugEnabled(true)
+	}
 	b.ins.Reflow = sqlS.reflow
 	b.ins.AutoComplete = b.getCompletions
 	b.ins.CheckInputComplete = b.checkInputComplete

pkg/cli/clisqlshell/sql.go

@@ -2277,6 +2277,11 @@ func (c *cliState) runStatements(stmts []string) error {
 	return c.exitErr
 }
 
+// enableDebug implements the sqlShell interface (to support the editor).
+func (c *cliState) enableDebug() bool {
+	return c.sqlConnCtx.DebugMode
+}
+
 // serverSideParse implements the sqlShell interface (to support the editor).
 // It uses the SHOW SYNTAX statement to analyze the given string.
 // If the syntax is correct, the function returns the statement