[#2357] improvement(trino): Fix varchar type mapping between Gravitino JDBC catalog and Trino

integration-test/src/test/java/com/datastrato/gravitino/integration/test/trino/TrinoQueryIT.java

@@ -269,7 +269,8 @@ static boolean match(String expectResult, String result) {
     if (expectResult.startsWith("<QUERY_FAILED>")) {
       boolean match =
           Pattern.compile(
-                  "^Query \\w+ failed.*: " + expectResult.replace("<QUERY_FAILED>", "").trim())
+                  "^Query \\w+ failed.*: "
+                      + Pattern.quote(expectResult.replace("<QUERY_FAILED>", "").trim()))
               .matcher(result)
               .find();
       return match;

integration-test/src/test/resources/trino-ci-testset/testsets/jdbc-mysql/00007_varchar.sql

@@ -0,0 +1,44 @@
+CREATE SCHEMA "test.gt_mysql".varchar_db1;
+
+USE "test.gt_mysql".varchar_db1;
+
+CREATE TABLE tb01 (id int, name char(20));
+
+SHOW CREATE TABLE "test.gt_mysql".varchar_db1.tb01;
+
+CREATE TABLE tb02 (id int, name char(255));
+
+SHOW CREATE TABLE "test.gt_mysql".varchar_db1.tb02;
+
+CREATE TABLE tb03 (id int, name char(256));
+
+CREATE TABLE tb04 (id int, name varchar(250));
+
+SHOW CREATE TABLE "test.gt_mysql".varchar_db1.tb04;
+
+CREATE TABLE tb05 (id int, name varchar(256));
+
+SHOW CREATE TABLE "test.gt_mysql".varchar_db1.tb05;
+
+CREATE TABLE tb06 (id int, name char);
+
+SHOW CREATE TABLE "test.gt_mysql".varchar_db1.tb06;
+
+CREATE TABLE tb07 (id int, name varchar);
+
+SHOW CREATE TABLE "test.gt_mysql".varchar_db1.tb07;
+
+drop table "test.gt_mysql".varchar_db1.tb01;
+
+drop table "test.gt_mysql".varchar_db1.tb02;
+
+drop table "test.gt_mysql".varchar_db1.tb04;
+
+drop table "test.gt_mysql".varchar_db1.tb05;
+
+drop table "test.gt_mysql".varchar_db1.tb06;
+
+drop table "test.gt_mysql".varchar_db1.tb07;
+
+drop schema "test.gt_mysql".varchar_db1;
+

integration-test/src/test/resources/trino-ci-testset/testsets/jdbc-mysql/00007_varchar.txt

@@ -0,0 +1,85 @@
+CREATE SCHEMA
+
+USE
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_mysql"".varchar_db1.tb01 (
+   id integer,
+   name char(20)
+)
+COMMENT ''
+WITH (
+   engine = 'InnoDB'
+)"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_mysql"".varchar_db1.tb02 (
+   id integer,
+   name char(255)
+)
+COMMENT ''
+WITH (
+   engine = 'InnoDB'
+)"
+
+<QUERY_FAILED> MySQL does not support the datatype CHAR with the length greater than 255
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_mysql"".varchar_db1.tb04 (
+   id integer,
+   name varchar(250)
+)
+COMMENT ''
+WITH (
+   engine = 'InnoDB'
+)"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_mysql"".varchar_db1.tb05 (
+   id integer,
+   name varchar(256)
+)
+COMMENT ''
+WITH (
+   engine = 'InnoDB'
+)"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_mysql"".varchar_db1.tb06 (
+   id integer,
+   name char(1)
+)
+COMMENT ''
+WITH (
+   engine = 'InnoDB'
+)"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_mysql"".varchar_db1.tb07 (
+   id integer,
+   name varchar
+)
+COMMENT ''
+WITH (
+   engine = 'InnoDB'
+)"
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP SCHEMA

integration-test/src/test/resources/trino-ci-testset/testsets/jdbc-postgresql/00004_query_pushdown.txt

@@ -20,7 +20,7 @@ INSERT: 15000 rows
 "Trino version: %
 %
     └─ TableScan[table = test.gt_postgresql:gt_db1.customer gt_db1.customer constraints=[ParameterizedExpression[expression=(""phone"") LIKE (?), parameters=[QueryParameter{jdbcType=Optional.empty, type=varchar(6), value=Optional[Slice{base=[B@%, baseOffset=0, length=6}]}]]] limit=10]
-           Layout: [custkey:bigint, name:varchar, address:varchar, nationkey:bigint, phone:varchar, acctbal:decimal(12,2), mktsegment:varchar, comment:varchar]
+           Layout: [custkey:bigint, name:varchar(25), address:varchar(40), nationkey:bigint, phone:varchar(15), acctbal:decimal(12,2), mktsegment:varchar(10), comment:varchar(117)]
 %
 "
 

integration-test/src/test/resources/trino-ci-testset/testsets/jdbc-postgresql/00006_datatype.txt

@@ -5,8 +5,8 @@ USE
 CREATE TABLE
 
 "CREATE TABLE ""test.gt_postgresql"".gt_db1.tb01 (
-   f1 varchar,
-   f2 varchar,
+   f1 varchar(200),
+   f2 char(20),
    f3 varbinary,
    f4 decimal(10, 3),
    f5 real,
@@ -26,14 +26,14 @@ INSERT: 1 row
 
 INSERT: 1 row
 
-"Sample text 1","Text1","65","123.456","7.89","12.34","false","100","1000","1000","100000","2024-01-01","08:00:00.000","2024-01-01 08:00:00.000"
+"Sample text 1","Text1               ","65","123.456","7.89","12.34","false","100","1000","1000","100000","2024-01-01","08:00:00.000","2024-01-01 08:00:00.000"
 "","","","","","","","","","","","","",""
 
 CREATE TABLE
 
 "CREATE TABLE ""test.gt_postgresql"".gt_db1.tb02 (
-   f1 varchar NOT NULL,
-   f2 varchar NOT NULL,
+   f1 varchar(200) NOT NULL,
+   f2 char(20) NOT NULL,
    f3 varbinary NOT NULL,
    f4 decimal(10, 3) NOT NULL,
    f5 real NOT NULL,

integration-test/src/test/resources/trino-ci-testset/testsets/jdbc-postgresql/00007_varchar.sql

@@ -0,0 +1,46 @@
+CREATE SCHEMA "test.gt_postgresql".varchar_db1;
+
+USE "test.gt_postgresql".varchar_db1;
+
+CREATE TABLE tb01 (id int, name char(20));
+
+SHOW CREATE TABLE "test.gt_postgresql".varchar_db1.tb01;
+
+CREATE TABLE tb02 (id int, name char(65536));
+
+SHOW CREATE TABLE "test.gt_postgresql".varchar_db1.tb02;
+
+CREATE TABLE tb03 (id int, name char(65537));
+
+CREATE TABLE tb04 (id int, name varchar(250));
+
+SHOW CREATE TABLE "test.gt_postgresql".varchar_db1.tb04;
+
+CREATE TABLE tb05 (id int, name varchar(10485760));
+
+SHOW CREATE TABLE "test.gt_postgresql".varchar_db1.tb05;
+
+CREATE TABLE tb06 (id int, name varchar(10485761));
+
+CREATE TABLE tb06 (id int, name char);
+
+SHOW CREATE TABLE "test.gt_postgresql".varchar_db1.tb06;
+
+CREATE TABLE tb07 (id int, name varchar);
+
+SHOW CREATE TABLE "test.gt_postgresql".varchar_db1.tb07;
+
+drop table "test.gt_postgresql".varchar_db1.tb01;
+
+drop table "test.gt_postgresql".varchar_db1.tb02;
+
+drop table "test.gt_postgresql".varchar_db1.tb04;
+
+drop table "test.gt_postgresql".varchar_db1.tb05;
+
+drop table "test.gt_postgresql".varchar_db1.tb06;
+
+drop table "test.gt_postgresql".varchar_db1.tb07;
+
+drop schema "test.gt_postgresql".varchar_db1;
+

integration-test/src/test/resources/trino-ci-testset/testsets/jdbc-postgresql/00007_varchar.txt

@@ -0,0 +1,69 @@
+CREATE SCHEMA
+
+USE
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_postgresql"".varchar_db1.tb01 (
+   id integer,
+   name char(20)
+)
+COMMENT ''"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_postgresql"".varchar_db1.tb02 (
+   id integer,
+   name char(65536)
+)
+COMMENT ''"
+
+<QUERY_FAILED> Unknown type 'char(65537)' for column 'name'
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_postgresql"".varchar_db1.tb04 (
+   id integer,
+   name varchar(250)
+)
+COMMENT ''"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_postgresql"".varchar_db1.tb05 (
+   id integer,
+   name varchar(10485760)
+)
+COMMENT ''"
+
+<QUERY_FAILED> length for type varchar cannot exceed 10485760
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_postgresql"".varchar_db1.tb06 (
+   id integer,
+   name char(1)
+)
+COMMENT ''"
+
+CREATE TABLE
+
+"CREATE TABLE ""test.gt_postgresql"".varchar_db1.tb07 (
+   id integer,
+   name varchar
+)
+COMMENT ''"
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP TABLE
+
+DROP SCHEMA

trino-connector/src/main/java/com/datastrato/gravitino/trino/connector/catalog/jdbc/mysql/MySQLDataTypeTransformer.java

@@ -11,27 +11,65 @@
 import com.datastrato.gravitino.trino.connector.GravitinoErrorCode;
 import com.datastrato.gravitino.trino.connector.util.GeneralDataTypeTransformer;
 import io.trino.spi.TrinoException;
+import io.trino.spi.type.CharType;
 
 /** Type transformer between MySQL and Trino */
 public class MySQLDataTypeTransformer extends GeneralDataTypeTransformer {
   private static final int MYSQL_CHAR_LENGTH_LIMIT = 255;
+  // 65535 / 4 = 16383, in fact, MySQL limit the row size to 65535, and the utf8mb4 character set
+  // uses 4 bytes per character. In fact, if a row has several varchar columns, the length of each
+  // column should be less than 16383. For more details, please refer to
+  // https://dev.mysql.com/doc/refman/8.0/en/char.html
+  private static final int MYSQL_VARCHAR_LENGTH_LIMIT = 16383;
+
+  @Override
+  public io.trino.spi.type.Type getTrinoType(Type type) {
+    if (type.name() == Name.STRING) {
+      return io.trino.spi.type.VarcharType.createUnboundedVarcharType();
+    }
+
+    return super.getTrinoType(type);
+  }
 
   @Override
   public Type getGravitinoType(io.trino.spi.type.Type type) {
-    Type gravitinoType = super.getGravitinoType(type);
-    if (gravitinoType.name() == Name.VARCHAR) {
-      if (((Types.VarCharType) gravitinoType).length() > MYSQL_CHAR_LENGTH_LIMIT) {
+    Class<? extends io.trino.spi.type.Type> typeClass = type.getClass();
+    if (typeClass == io.trino.spi.type.CharType.class) {
+      CharType charType = (CharType) type;
+      if (charType.getLength() > MYSQL_CHAR_LENGTH_LIMIT) {
+        throw new TrinoException(
+            GravitinoErrorCode.GRAVITINO_ILLEGAL_ARGUMENT,
+            "MySQL does not support the datatype CHAR with the length greater than "
+                + MYSQL_CHAR_LENGTH_LIMIT);
+      }
+
+      // We do not support the CHAR without a length.
+      if (charType.getLength() == 0) {
+        throw new TrinoException(
+            GravitinoErrorCode.GRAVITINO_ILLEGAL_ARGUMENT,
+            "MySQL does not support the datatype CHAR with the length 0");
+      }
+
+      return Types.FixedCharType.of(charType.getLength());
+    } else if (typeClass == io.trino.spi.type.VarcharType.class) {
+      io.trino.spi.type.VarcharType varcharType = (io.trino.spi.type.VarcharType) type;
+
+      // If the length is not specified, it is a VARCHAR without length, we convert it to a string
+      // type.
+      if (varcharType.getLength().isEmpty()) {
         return Types.StringType.get();
       }
-    }
 
-    if (gravitinoType.name() == Name.FIXEDCHAR) {
-      if (((Types.FixedCharType) gravitinoType).length() > MYSQL_CHAR_LENGTH_LIMIT) {
+      int length = varcharType.getLength().get();
+      if (length > MYSQL_VARCHAR_LENGTH_LIMIT) {
         throw new TrinoException(
             GravitinoErrorCode.GRAVITINO_ILLEGAL_ARGUMENT,
-            "MySQL does not support the datatype CHAR with the length greater than 255");
+            "MySQL does not support the datatype VARCHAR with the length greater than "
+                + MYSQL_VARCHAR_LENGTH_LIMIT);
       }
+      return Types.VarCharType.of(length);
     }
-    return gravitinoType;
+
+    return super.getGravitinoType(type);
   }
 }