flink-cdc-connect/flink-cdc-source-connectors/flink-connector-db2-cdc/src/main/java/org/apache/flink/cdc/connectors/db2/table/Db2ReadableMetaData.java [35:105]:
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    TABLE_NAME(
            "table_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.TABLE_NAME_KEY));
                }
            }),

    /** Name of the schema that contain the row. */
    SCHEMA_NAME(
            "schema_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.SCHEMA_NAME_KEY));
                }
            }),

    /** 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));
                }
            });

    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-sqlserver-cdc/src/main/java/org/apache/flink/cdc/connectors/sqlserver/table/SqlServerReadableMetadata.java [34:104]:
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    TABLE_NAME(
            "table_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.TABLE_NAME_KEY));
                }
            }),

    /** Name of the schema that contain the row. */
    SCHEMA_NAME(
            "schema_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.SCHEMA_NAME_KEY));
                }
            }),

    /** 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));
                }
            });

    private final String key;

    private final DataType dataType;

    private final MetadataConverter converter;
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