flink-cdc-connect/flink-cdc-source-connectors/flink-connector-mysql-cdc/src/main/java/org/apache/flink/cdc/connectors/mysql/table/MySqlReadableMetadata.java [49:112]:
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            }),

    /** Name of the database that contain the row. */
    DATABASE_NAME(
            "database_name",
            DataTypes.STRING().notNull(),
            new MetadataConverter() {
                private static final long serialVersionUID = 1L;

                @Override
                public Object read(SourceRecord record) {
                    Struct messageStruct = (Struct) record.value();
                    Struct sourceStruct = messageStruct.getStruct(Envelope.FieldName.SOURCE);
                    return StringData.fromString(
                            sourceStruct.getString(AbstractSourceInfo.DATABASE_NAME_KEY));
                }
            }),

    /**
     * It indicates the time that the change was made in the database. If the record is read from
     * snapshot of the table instead of the binlog, the value is always 0.
     */
    OP_TS(
            "op_ts",
            DataTypes.TIMESTAMP_LTZ(3).notNull(),
            new MetadataConverter() {
                private static final long serialVersionUID = 1L;

                @Override
                public Object read(SourceRecord record) {
                    Struct messageStruct = (Struct) record.value();
                    Struct sourceStruct = messageStruct.getStruct(Envelope.FieldName.SOURCE);
                    return TimestampData.fromEpochMillis(
                            (Long) sourceStruct.get(AbstractSourceInfo.TIMESTAMP_KEY));
                }
            }),

    /**
     * It indicates the row kind of the changelog. '+I' means INSERT message, '-D' means DELETE
     * message, '-U' means UPDATE_BEFORE message and '+U' means UPDATE_AFTER message
     */
    ROW_KIND(
            "row_kind",
            DataTypes.STRING().notNull(),
            new RowDataMetadataConverter() {
                private static final long serialVersionUID = 1L;

                @Override
                public Object read(RowData rowData) {
                    return StringData.fromString(rowData.getRowKind().shortString());
                }

                @Override
                public Object read(SourceRecord record) {
                    throw new UnsupportedOperationException(
                            "Please call read(RowData rowData) method instead.");
                }
            });

    private final String key;

    private final DataType dataType;

    private final MetadataConverter converter;
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flink-cdc-connect/flink-cdc-source-connectors/flink-connector-postgres-cdc/src/main/java/org/apache/flink/cdc/connectors/postgres/table/PostgreSQLReadableMetadata.java [65:128]:
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            }),

    /** Name of the database that contain the row. */
    DATABASE_NAME(
            "database_name",
            DataTypes.STRING().notNull(),
            new MetadataConverter() {
                private static final long serialVersionUID = 1L;

                @Override
                public Object read(SourceRecord record) {
                    Struct messageStruct = (Struct) record.value();
                    Struct sourceStruct = messageStruct.getStruct(Envelope.FieldName.SOURCE);
                    return StringData.fromString(
                            sourceStruct.getString(AbstractSourceInfo.DATABASE_NAME_KEY));
                }
            }),

    /**
     * It indicates the time that the change was made in the database. If the record is read from
     * snapshot of the table instead of the change stream, the value is always 0.
     */
    OP_TS(
            "op_ts",
            DataTypes.TIMESTAMP_LTZ(3).notNull(),
            new MetadataConverter() {
                private static final long serialVersionUID = 1L;

                @Override
                public Object read(SourceRecord record) {
                    Struct messageStruct = (Struct) record.value();
                    Struct sourceStruct = messageStruct.getStruct(Envelope.FieldName.SOURCE);
                    return TimestampData.fromEpochMillis(
                            (Long) sourceStruct.get(AbstractSourceInfo.TIMESTAMP_KEY));
                }
            }),

    /**
     * It indicates the row kind of the changelog. '+I' means INSERT message, '-D' means DELETE
     * message, '-U' means UPDATE_BEFORE message and '+U' means UPDATE_AFTER message
     */
    ROW_KIND(
            "row_kind",
            DataTypes.STRING().notNull(),
            new RowDataMetadataConverter() {
                private static final long serialVersionUID = 1L;

                @Override
                public Object read(RowData rowData) {
                    return StringData.fromString(rowData.getRowKind().shortString());
                }

                @Override
                public Object read(SourceRecord record) {
                    throw new UnsupportedOperationException(
                            "Please call read(RowData rowData) method instead.");
                }
            });

    private final String key;

    private final DataType dataType;

    private final MetadataConverter converter;
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