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<div class="subTitle">org.apache.beam.sdk.io.gcp.spanner.changestreams.mapper</div>
<h2 title="Class ChangeStreamRecordMapper" class="title">Class ChangeStreamRecordMapper</h2>
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<pre>public class <span class="typeNameLabel">ChangeStreamRecordMapper</span>
extends java.lang.Object</pre>
<div class="block">This class is responsible for transforming a <code>Struct</code> to a <code>List</code> of <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChangeStreamRecord.html" title="interface in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ChangeStreamRecord</code></a> models.
<p>The change stream full specification can be seen in the internal documentation
https://docs.google.com/document/d/1nLlMGvQLIeUSDNmtoLT9vaQo0hVGl4CIf6iCSOkdIbA/edit#bookmark=id.fxgtygh8eony</div>
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<td class="colFirst"><code>java.util.List&lt;<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChangeStreamRecord.html" title="interface in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">ChangeStreamRecord</a>&gt;</code></td>
<td class="colLast"><code><span class="memberNameLink"><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#toChangeStreamRecords-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-org.apache.beam.sdk.io.gcp.spanner.changestreams.dao.ChangeStreamResultSet-org.apache.beam.sdk.io.gcp.spanner.changestreams.dao.ChangeStreamResultSetMetadata-">toChangeStreamRecords</a></span>(<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">PartitionMetadata</a>&nbsp;partition,
<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/ChangeStreamResultSet.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao">ChangeStreamResultSet</a>&nbsp;resultSet,
<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/ChangeStreamResultSetMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao">ChangeStreamResultSetMetadata</a>&nbsp;resultSetMetadata)</code>
<div class="block">In GoogleSQL, change stream records are returned as an array of <code>Struct</code>.</div>
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<a name="toChangeStreamRecords-org.apache.beam.sdk.io.gcp.spanner.changestreams.model.PartitionMetadata-org.apache.beam.sdk.io.gcp.spanner.changestreams.dao.ChangeStreamResultSet-org.apache.beam.sdk.io.gcp.spanner.changestreams.dao.ChangeStreamResultSetMetadata-">
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<h4>toChangeStreamRecords</h4>
<pre>public&nbsp;java.util.List&lt;<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChangeStreamRecord.html" title="interface in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">ChangeStreamRecord</a>&gt;&nbsp;toChangeStreamRecords(<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model">PartitionMetadata</a>&nbsp;partition,
<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/ChangeStreamResultSet.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao">ChangeStreamResultSet</a>&nbsp;resultSet,
<a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/ChangeStreamResultSetMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao">ChangeStreamResultSetMetadata</a>&nbsp;resultSetMetadata)</pre>
<div class="block">In GoogleSQL, change stream records are returned as an array of <code>Struct</code>. In PostgresQL,
change stream records are returned as <code>Jsonb</code> Transforms a <code>/ Jsonb</code>
representing a change stream result into a <code>List</code> of <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChangeStreamRecord.html" title="interface in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ChangeStreamRecord</code></a> model.
The type of the change stream record will be identified and one of the following subclasses can
be returned within the resulting <code>List</code>:
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/DataChangeRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>DataChangeRecord</code></a>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/HeartbeatRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>HeartbeatRecord</code></a>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChildPartitionsRecord.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ChildPartitionsRecord</code></a>
</ul>
Additionally to the <code>/ Jsonb</code> received, the originating partition of the records
(given by the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/PartitionMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>PartitionMetadata</code></a> parameter) and the stream metadata (given by the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/dao/ChangeStreamResultSetMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.dao"><code>ChangeStreamResultSetMetadata</code></a>) are used to populate the <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChangeStreamRecordMetadata.html" title="class in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ChangeStreamRecordMetadata</code></a> for
each record mapped.
<p>The <code>/ Jsonb</code> is expected to have the following fields:
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#DATA_CHANGE_RECORD_COLUMN"><code>DATA_CHANGE_RECORD_COLUMN</code></a>: non-nullable <code>Struct</code>
list of data change records or a <code>Jsonb</code> representing a child partition record.
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#COMMIT_TIMESTAMP_COLUMN"><code>COMMIT_TIMESTAMP_COLUMN</code></a>: non-nullable <code>Timestamp</code> representing the timestamp at which the modifications within the record
were committed in Cloud Spanner.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#SERVER_TRANSACTION_ID_COLUMN"><code>SERVER_TRANSACTION_ID_COLUMN</code></a>: non-nullable <code>String</code> representing the unique transaction id in which the modifications for this
record occurred.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#IS_LAST_RECORD_IN_TRANSACTION_IN_PARTITION_COLUMN"><code>IS_LAST_RECORD_IN_TRANSACTION_IN_PARTITION_COLUMN</code></a>:
non-nullable <code>Boolean</code> indicating whether this record is the last emitted for
the transaction.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#RECORD_SEQUENCE_COLUMN"><code>RECORD_SEQUENCE_COLUMN</code></a>: non-nullable <code>String</code> representing the order in which this record appears within the context of a
partition, commit timestamp and transaction.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#TABLE_NAME_COLUMN"><code>TABLE_NAME_COLUMN</code></a>: non-nullable <code>String</code>
representing the name of the table in which the modifications for this record
occurred.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#COLUMN_TYPES_COLUMN"><code>COLUMN_TYPES_COLUMN</code></a>: non-nullable <code>List</code> of
<code>Struct</code>s representing the type of the primary keys and modified columns
within this record.
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#NAME_COLUMN"><code>NAME_COLUMN</code></a>: non-nullable <code>String</code>
representing the name of a column.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#TYPE_COLUMN"><code>TYPE_COLUMN</code></a>: non-nullable <code>String</code>
representing the type of a column.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#IS_PRIMARY_KEY_COLUMN"><code>IS_PRIMARY_KEY_COLUMN</code></a>: non-nullable <code>Boolean</code> indicating if the column is part of the primary key.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#ORDINAL_POSITION_COLUMN"><code>ORDINAL_POSITION_COLUMN</code></a>: non-nullable <code>Long</code> representing the position of the column in the table it is defined.
</ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#MODS_COLUMN"><code>MODS_COLUMN</code></a>: non-nullable <code>List</code> of <code>Struct</code>s representing the data modifications within this record.
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#KEYS_COLUMN"><code>KEYS_COLUMN</code></a>: non-nullable <code>String</code>
json object, where keys are the primary key column names, and the values are
their corresponding values.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#OLD_VALUES_COLUMN"><code>OLD_VALUES_COLUMN</code></a>: nullable <code>String</code>
json object displaying the old state of the columns modified, where keys are
the column names, and the values are their corresponding values.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#NEW_VALUES_COLUMN"><code>NEW_VALUES_COLUMN</code></a>: nullable <code>String</code>
json object displaying the new state of the columns modified, where keys are
the column names, and the values are their corresponding values.
</ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#MOD_TYPE_COLUMN"><code>MOD_TYPE_COLUMN</code></a>: non-nullable <code>String</code>
representing the type of operation that caused the modifications (see also <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ModType.html" title="enum in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ModType</code></a>.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#VALUE_CAPTURE_TYPE_COLUMN"><code>VALUE_CAPTURE_TYPE_COLUMN</code></a>: non-nullable <code>String</code> representing the capture type of the change stream that generated this
record (see also <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ValueCaptureType.html" title="enum in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ValueCaptureType</code></a>).
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#NUMBER_OF_RECORDS_IN_TRANSACTION_COLUMN"><code>NUMBER_OF_RECORDS_IN_TRANSACTION_COLUMN</code></a>:
non-nullable <code>Long</code> representing the total number of data change records for
the transaction in which this record occurred.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#NUMBER_OF_PARTITIONS_IN_TRANSACTION_COLUMN"><code>NUMBER_OF_PARTITIONS_IN_TRANSACTION_COLUMN</code></a>:
non-nullable <code>Long</code> representing the total number of partitions for the
transaction in which this record occurred.
</ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#HEARTBEAT_RECORD_COLUMN"><code>HEARTBEAT_RECORD_COLUMN</code></a>: non-nullable <code>Struct</code>
list of hearbeat records or a <code>Jsonb</code> representing a child partition record.
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#TIMESTAMP_COLUMN"><code>TIMESTAMP_COLUMN</code></a>: non-nullable <code>Timestamp</code>
representing the timestamp for which the change stream query has returned all
changes (see more in <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/HeartbeatRecord.html#getTimestamp--"><code>HeartbeatRecord.getTimestamp()</code></a>.
</ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#CHILD_PARTITIONS_RECORD_COLUMN"><code>CHILD_PARTITIONS_RECORD_COLUMN</code></a>: non-nullable <code>Struct</code> list of child partitions records or a <code>Jsonb</code> representing a child
partition record.
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#START_TIMESTAMP_COLUMN"><code>START_TIMESTAMP_COLUMN</code></a>: non-nullable <code>Timestamp</code> representing the timestamp at which the new partition started being
valid in Cloud Spanner.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#RECORD_SEQUENCE_COLUMN"><code>RECORD_SEQUENCE_COLUMN</code></a>: non-nullable <code>String</code> representing the order in which this record appears within the context of a
partition and commit timestamp.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#CHILD_PARTITIONS_COLUMN"><code>CHILD_PARTITIONS_COLUMN</code></a>: non-nullable <code>List</code>
of <code>Struct</code> representing the new child partitions.
<ul>
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#TOKEN_COLUMN"><code>TOKEN_COLUMN</code></a>: non-nullable <code>String</code>
representing the unique identifier of the new child partition.
<li><a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/mapper/ChangeStreamRecordMapper.html#PARENT_PARTITION_TOKENS_COLUMN"><code>PARENT_PARTITION_TOKENS_COLUMN</code></a>: non-nullable
<code>List</code> of <code>String</code> representing the unique identifier(s) of
parent partition(s) where this child partition originated from.
</ul>
</ul>
</ul></div>
<dl>
<dt><span class="paramLabel">Parameters:</span></dt>
<dd><code>partition</code> - the partition metadata from which the row was generated</dd>
<dd><code>resultSet</code> - the change stream result set</dd>
<dd><code>resultSetMetadata</code> - the metadata generated when reading the change stream row</dd>
<dt><span class="returnLabel">Returns:</span></dt>
<dd>a <code>List</code> of <a href="../../../../../../../../../org/apache/beam/sdk/io/gcp/spanner/changestreams/model/ChangeStreamRecord.html" title="interface in org.apache.beam.sdk.io.gcp.spanner.changestreams.model"><code>ChangeStreamRecord</code></a> subclasses</dd>
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