flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/databases/oracle/dialect/OracleDialect.java [141:162]:
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    public Set<LogicalTypeRoot> supportedTypes() {
        // The data types used in Oracle are list at:
        // https://www.techonthenet.com/oracle/datatypes.php

        return EnumSet.of(
                LogicalTypeRoot.CHAR,
                LogicalTypeRoot.VARCHAR,
                LogicalTypeRoot.BOOLEAN,
                LogicalTypeRoot.VARBINARY,
                LogicalTypeRoot.DECIMAL,
                LogicalTypeRoot.TINYINT,
                LogicalTypeRoot.SMALLINT,
                LogicalTypeRoot.INTEGER,
                LogicalTypeRoot.BIGINT,
                LogicalTypeRoot.FLOAT,
                LogicalTypeRoot.DOUBLE,
                LogicalTypeRoot.DATE,
                LogicalTypeRoot.TIME_WITHOUT_TIME_ZONE,
                LogicalTypeRoot.TIMESTAMP_WITHOUT_TIME_ZONE,
                LogicalTypeRoot.TIMESTAMP_WITH_LOCAL_TIME_ZONE,
                LogicalTypeRoot.ARRAY);
    }
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flink-connector-jdbc/src/main/java/org/apache/flink/connector/jdbc/dialect/AbstractPostgresCompatibleDialect.java [86:111]:
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    public Set<LogicalTypeRoot> supportedTypes() {
        // The data types used in PostgreSQL are list at:
        // https://www.postgresql.org/docs/12/datatype.html

        // TODO: We can't convert BINARY data type to
        //  PrimitiveArrayTypeInfo.BYTE_PRIMITIVE_ARRAY_TYPE_INFO in
        // LegacyTypeInfoDataTypeConverter.

        return EnumSet.of(
                LogicalTypeRoot.CHAR,
                LogicalTypeRoot.VARCHAR,
                LogicalTypeRoot.BOOLEAN,
                LogicalTypeRoot.VARBINARY,
                LogicalTypeRoot.DECIMAL,
                LogicalTypeRoot.TINYINT,
                LogicalTypeRoot.SMALLINT,
                LogicalTypeRoot.INTEGER,
                LogicalTypeRoot.BIGINT,
                LogicalTypeRoot.FLOAT,
                LogicalTypeRoot.DOUBLE,
                LogicalTypeRoot.DATE,
                LogicalTypeRoot.TIME_WITHOUT_TIME_ZONE,
                LogicalTypeRoot.TIMESTAMP_WITHOUT_TIME_ZONE,
                LogicalTypeRoot.TIMESTAMP_WITH_LOCAL_TIME_ZONE,
                LogicalTypeRoot.ARRAY);
    }
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