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*: Support create local temporary table if not exist #25983

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merged 2 commits into from
Jul 7, 2021
Merged

*: Support create local temporary table if not exist #25983

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*: Support create local temporary table if not exist
lcwangchao Jul 6, 2021
7dff9fe
Merge branch 'master' into c_temp_if_notexists
tiancaiamao Jul 7, 2021
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6 changes: 6 additions & 0 deletions ddl/db_integration_test.go
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Original file line number Diff line number Diff line change
Expand Up @@ -2825,6 +2825,12 @@ func (s *testIntegrationSuite3) TestCreateTemporaryTable(c *C) {
tk.MustExec("rollback")
tk.MustQuery("select * from check_data").Check(testkit.Rows())

// Check create temporary table for if not exists
tk.MustExec("create temporary table b_local_temp_table (id int)")
_, err = tk.Exec("create temporary table b_local_temp_table (id int)")
c.Assert(infoschema.ErrTableExists.Equal(err), IsTrue)
tk.MustExec("create temporary table if not exists b_local_temp_table (id int)")

// Stale read see the local temporary table but can't read on it.
tk.MustExec("START TRANSACTION READ ONLY AS OF TIMESTAMP NOW(3)")
tk.MustGetErrMsg("select * from overlap", "can not stale read temporary table")
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9 changes: 8 additions & 1 deletion executor/ddl.go
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Expand Up @@ -256,7 +256,14 @@ func (e *DDLExec) createSessionTemporaryTable(s *ast.CreateTableStmt) error {
sessVars.LocalTemporaryTables = infoschema.NewLocalTemporaryTables()
}
localTempTables := sessVars.LocalTemporaryTables.(*infoschema.LocalTemporaryTables)
return localTempTables.AddTable(dbInfo, tbl)
err = localTempTables.AddTable(dbInfo, tbl)

if err != nil && s.IfNotExists && infoschema.ErrTableExists.Equal(err) {
e.ctx.GetSessionVars().StmtCtx.AppendNote(err)
return nil
}

return err
}

func (e *DDLExec) executeCreateView(s *ast.CreateViewStmt) error {
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