https://nightlies.apache.org/flink/flink-docs-release-1.15/zh/docs/dev/table/types/

    MySQL type PostgreSQL type Flink SQL type
    TINYINT TINYINT
    SMALLINT,
    TINYINT UNSIGNED    		 SMALLINT,
    INT2,
    SMALLSERIAL,
    SERIAL2    		 SMALLINT
    INT,
    MEDIUMINT,
    SMALLINT UNSIGNED    		 INTEGER,
    SERIAL    		 INT
    BIGINT,
    INT UNSIGNED    		 BIGINT,
    BIGSERIAL    		 BIGINT
    BIGINT UNSIGNED DECIMAL(20,0)
    BIGINT BIGINT BIGINT
    FLOAT REAL,
    FLOAT4    		 FLOAT
    DOUBLE,
    DOUBLE PRECISION    		 FLOAT8,
    DOUBLE PRECISION    		 DOUBLE
    NUMERIC(p, s),
    DECIMAL(p, s)    		 NUMERIC(p, s),
    DECIMAL(p, s)    		 DECIMAL(p, s)
    BOOLEAN,
    TINYINT(1)    		 BOOLEAN BOOLEAN
    DATE DATE DATE
    TIME [(p)] TIME [(p)] [WITHOUT TIMEZONE] TIME [(p)] [WITHOUT TIMEZONE]
    DATETIME [(p)] TIMESTAMP [(p)] [WITHOUT TIMEZONE] TIMESTAMP [(p)] [WITHOUT TIMEZONE]
    CHAR(n),
    VARCHAR(n),
    TEXT    		 CHAR(n),
    CHARACTER(n),
    VARCHAR(n),
    CHARACTER VARYING(n),
    TEXT    		 STRING
    BINARY,
    VARBINARY,
    BLOB    		 BYTEA BYTES
    ARRAY ARRAY