fix test expectation

Author: elianddb

enginetest/queries/script_queries.go

@@ -158,7 +158,7 @@ var ScriptTests = []ScriptTest{
 			{
 				Query: "SHOW KEYS FROM ost_user__cdata WHERE Key_name = 'PRIMARY'",
 				Expected: []sql.Row{
-					{"ost_user__cdata", 0, "PRIMARY", 1, "user_id", nil, 0, nil, nil, "YES", "BTREE", "", "", "YES", nil},
+					{"ost_user__cdata", 0, "PRIMARY", 1, "user_id", nil, 0, nil, nil, "", "BTREE", "", "", "YES", nil},
 				},
 			},
 		},

sql/analyzer/resolve_create_select.go

@@ -50,7 +50,9 @@ func resolveCreateSelect(ctx *sql.Context, a *Analyzer, n sql.Node, scope *plan.
 		if idx.IsPrimary() {
 			for _, idxCol := range idx.Columns {
 				if i, ok := colNameToIdx[idxCol.Name]; ok {
+					// https://dev.mysql.com/doc/refman/8.0/en/create-table.html
 					newSch[i].PrimaryKey = true
+					newSch[i].Nullable = false
 					pkOrdinals = append(pkOrdinals, i)
 				}
 			}