sql/parse: allow qualified table names on SHOW CREATE TABLE

sql/parse/parse_test.go

@@ -1007,7 +1007,9 @@ var fixtures = map[string]sql.Node{
 		),
 		plan.NewShowCollation(),
 	),
-	`ROLLBACK`: plan.NewRollback(),
+	`ROLLBACK`:                           plan.NewRollback(),
+	"SHOW CREATE TABLE `mytable`":        plan.NewShowCreateTable("", nil, "mytable"),
+	"SHOW CREATE TABLE `mydb`.`mytable`": plan.NewShowCreateTable("mydb", nil, "mytable"),
 }
 
 func TestParse(t *testing.T) {

sql/parse/show_create.go

@@ -2,10 +2,9 @@ package parse
 
 import (
 	"bufio"
+	"io"
 	"strings"
-)
 
-import (
 	"gopkg.in/src-d/go-errors.v1"
 	"gopkg.in/src-d/go-mysql-server.v0/sql"
 	"gopkg.in/src-d/go-mysql-server.v0/sql/plan"
@@ -31,10 +30,24 @@ func parseShowCreate(s string) (sql.Node, error) {
 
 	switch strings.ToLower(thingToShow) {
 	case "table":
-		var name string
+		var db, table string
+
+		if err := readQuotableIdent(&table)(r); err != nil {
+			return nil, err
+		}
+
+		ru, _, err := r.ReadRune()
+		if err != nil && err != io.EOF {
+			return nil, err
+		} else if err == nil && ru == '.' {
+			db = table
+
+			if err := readQuotableIdent(&table)(r); err != nil {
+				return nil, err
+			}
+		}
 
-		err := parseFuncs{
-			readQuotableIdent(&name),
+		err = parseFuncs{
 			skipSpaces,
 			checkEOF,
 		}.exec(r)
@@ -43,9 +56,9 @@ func parseShowCreate(s string) (sql.Node, error) {
 		}
 
 		return plan.NewShowCreateTable(
-			sql.UnresolvedDatabase("").Name(),
+			db,
 			nil,
-			name), nil
+			table), nil
 	case "database", "schema":
 		var ifNotExists bool
 		var next string

sql/parse/show_create_test.go

@@ -32,9 +32,27 @@ func TestParseShowCreateTableQuery(t *testing.T) {
 		},
 		{
 			"SHOW CREATE TABLE mytable",
-			plan.NewShowCreateTable(sql.UnresolvedDatabase("").Name(),
-				nil,
-				"mytable"),
+			plan.NewShowCreateTable("", nil, "mytable"),
+			nil,
+		},
+		{
+			"SHOW CREATE TABLE `mytable`",
+			plan.NewShowCreateTable("", nil, "mytable"),
+			nil,
+		},
+		{
+			"SHOW CREATE TABLE mydb.`mytable`",
+			plan.NewShowCreateTable("mydb", nil, "mytable"),
+			nil,
+		},
+		{
+			"SHOW CREATE TABLE `mydb`.mytable",
+			plan.NewShowCreateTable("mydb", nil, "mytable"),
+			nil,
+		},
+		{
+			"SHOW CREATE TABLE `mydb`.`mytable`",
+			plan.NewShowCreateTable("mydb", nil, "mytable"),
 			nil,
 		},
 	}