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| <h1>Source code for pyspark.sql.merge</h1><div class="highlight"><pre> |
| <span></span><span class="c1">#</span> |
| <span class="c1"># Licensed to the Apache Software Foundation (ASF) under one or more</span> |
| <span class="c1"># contributor license agreements. See the NOTICE file distributed with</span> |
| <span class="c1"># this work for additional information regarding copyright ownership.</span> |
| <span class="c1"># The ASF licenses this file to You under the Apache License, Version 2.0</span> |
| <span class="c1"># (the "License"); you may not use this file except in compliance with</span> |
| <span class="c1"># the License. You may obtain a copy of the License at</span> |
| <span class="c1">#</span> |
| <span class="c1"># http://www.apache.org/licenses/LICENSE-2.0</span> |
| <span class="c1">#</span> |
| <span class="c1"># Unless required by applicable law or agreed to in writing, software</span> |
| <span class="c1"># distributed under the License is distributed on an "AS IS" BASIS,</span> |
| <span class="c1"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span> |
| <span class="c1"># See the License for the specific language governing permissions and</span> |
| <span class="c1"># limitations under the License.</span> |
| <span class="c1">#</span> |
| <span class="kn">import</span> <span class="nn">sys</span> |
| <span class="kn">from</span> <span class="nn">typing</span> <span class="kn">import</span> <span class="n">Dict</span><span class="p">,</span> <span class="n">Optional</span><span class="p">,</span> <span class="n">TYPE_CHECKING</span> |
| |
| <span class="kn">from</span> <span class="nn">pyspark.sql.column</span> <span class="kn">import</span> <span class="n">Column</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.utils</span> <span class="kn">import</span> <span class="n">to_scala_map</span> |
| |
| <span class="k">if</span> <span class="n">TYPE_CHECKING</span><span class="p">:</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.dataframe</span> <span class="kn">import</span> <span class="n">DataFrame</span> |
| |
| <span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s2">"MergeIntoWriter"</span><span class="p">]</span> |
| |
| |
| <span class="k">class</span> <span class="nc">MergeIntoWriter</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> `MergeIntoWriter` provides methods to define and execute merge actions based</span> |
| <span class="sd"> on specified conditions.</span> |
| |
| <span class="sd"> .. versionadded: 4.0.0</span> |
| <span class="sd"> """</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">df</span><span class="p">:</span> <span class="s2">"DataFrame"</span><span class="p">,</span> <span class="n">table</span><span class="p">:</span> <span class="nb">str</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Column</span><span class="p">):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_spark</span> <span class="o">=</span> <span class="n">df</span><span class="o">.</span><span class="n">sparkSession</span> |
| |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="n">df</span><span class="o">.</span><span class="n">_jdf</span><span class="o">.</span><span class="n">mergeInto</span><span class="p">(</span><span class="n">table</span><span class="p">,</span> <span class="n">_to_java_column</span><span class="p">(</span><span class="n">condition</span><span class="p">))</span> |
| |
| <div class="viewcode-block" id="MergeIntoWriter.whenMatched"><a class="viewcode-back" href="../../../reference/pyspark.sql/api/pyspark.sql.MergeIntoWriter.whenMatched.html#pyspark.sql.MergeIntoWriter.whenMatched">[docs]</a> <span class="k">def</span> <span class="nf">whenMatched</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Column</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter.WhenMatched"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Initialize a `WhenMatched` action with a condition.</span> |
| |
| <span class="sd"> This `WhenMatched` action will be executed when a source row matches a target table row</span> |
| <span class="sd"> based on the merge condition and the specified `condition` is satisfied.</span> |
| |
| <span class="sd"> This `WhenMatched` can be followed by one of the following merge actions:</span> |
| <span class="sd"> - `updateAll`: Update all the matched target table rows with source dataset rows.</span> |
| <span class="sd"> - `update(Dict)`: Update all the matched target table rows while changing only</span> |
| <span class="sd"> a subset of columns based on the provided assignment.</span> |
| <span class="sd"> - `delete`: Delete all target rows that have a match in the source table.</span> |
| <span class="sd"> """</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">WhenMatched</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">condition</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="MergeIntoWriter.whenNotMatched"><a class="viewcode-back" href="../../../reference/pyspark.sql/api/pyspark.sql.MergeIntoWriter.whenNotMatched.html#pyspark.sql.MergeIntoWriter.whenNotMatched">[docs]</a> <span class="k">def</span> <span class="nf">whenNotMatched</span><span class="p">(</span> |
| <span class="bp">self</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Column</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span> |
| <span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter.WhenNotMatched"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Initialize a `WhenNotMatched` action with a condition.</span> |
| |
| <span class="sd"> This `WhenNotMatched` action will be executed when a source row does not match any target</span> |
| <span class="sd"> row based on the merge condition and the specified `condition` is satisfied.</span> |
| |
| <span class="sd"> This `WhenNotMatched` can be followed by one of the following merge actions:</span> |
| <span class="sd"> - `insertAll`: Insert all rows from the source that are not already in the target table.</span> |
| <span class="sd"> - `insert(Dict)`: Insert all rows from the source that are not already in the target</span> |
| <span class="sd"> table, with the specified columns based on the provided assignment.</span> |
| <span class="sd"> """</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">WhenNotMatched</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">condition</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="MergeIntoWriter.whenNotMatchedBySource"><a class="viewcode-back" href="../../../reference/pyspark.sql/api/pyspark.sql.MergeIntoWriter.whenNotMatchedBySource.html#pyspark.sql.MergeIntoWriter.whenNotMatchedBySource">[docs]</a> <span class="k">def</span> <span class="nf">whenNotMatchedBySource</span><span class="p">(</span> |
| <span class="bp">self</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Column</span><span class="p">]</span> <span class="o">=</span> <span class="kc">None</span> |
| <span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter.WhenNotMatchedBySource"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Initialize a `WhenNotMatchedBySource` action with a condition.</span> |
| |
| <span class="sd"> This `WhenNotMatchedBySource` action will be executed when a target row does not match any</span> |
| <span class="sd"> rows in the source table based on the merge condition and the specified `condition`</span> |
| <span class="sd"> is satisfied.</span> |
| |
| <span class="sd"> This `WhenNotMatchedBySource` can be followed by one of the following merge actions:</span> |
| <span class="sd"> - `updateAll`: Update all the not matched target table rows with source dataset rows.</span> |
| <span class="sd"> - `update(Dict)`: Update all the not matched target table rows while changing only</span> |
| <span class="sd"> the specified columns based on the provided assignment.</span> |
| <span class="sd"> - `delete`: Delete all target rows that have no matches in the source table.</span> |
| <span class="sd"> """</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">WhenNotMatchedBySource</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">condition</span><span class="p">)</span></div> |
| |
| <div class="viewcode-block" id="MergeIntoWriter.withSchemaEvolution"><a class="viewcode-back" href="../../../reference/pyspark.sql/api/pyspark.sql.MergeIntoWriter.withSchemaEvolution.html#pyspark.sql.MergeIntoWriter.withSchemaEvolution">[docs]</a> <span class="k">def</span> <span class="nf">withSchemaEvolution</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Enable automatic schema evolution for this merge operation.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">withSchemaEvolution</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span></div> |
| |
| <div class="viewcode-block" id="MergeIntoWriter.merge"><a class="viewcode-back" href="../../../reference/pyspark.sql/api/pyspark.sql.MergeIntoWriter.merge.html#pyspark.sql.MergeIntoWriter.merge">[docs]</a> <span class="k">def</span> <span class="nf">merge</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Execute the merge operation.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">merge</span><span class="p">()</span></div> |
| |
| <span class="k">class</span> <span class="nc">WhenMatched</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> A class for defining actions to be taken when matching rows in a DataFrame during</span> |
| <span class="sd"> a merge operation."""</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">writer</span><span class="p">:</span> <span class="s2">"MergeIntoWriter"</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Column</span><span class="p">]):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> <span class="o">=</span> <span class="n">writer</span> |
| <span class="k">if</span> <span class="n">condition</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">when_matched</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">whenMatched</span><span class="p">()</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">when_matched</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">whenMatched</span><span class="p">(</span><span class="n">_to_java_column</span><span class="p">(</span><span class="n">condition</span><span class="p">))</span> |
| |
| <span class="k">def</span> <span class="nf">updateAll</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to update all matched rows in the DataFrame.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_matched</span><span class="o">.</span><span class="n">updateAll</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">assignments</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Column</span><span class="p">])</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to update matched rows in the DataFrame with the provided column</span> |
| <span class="sd"> assignments.</span> |
| <span class="sd"> """</span> |
| <span class="n">jvm</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_spark</span><span class="o">.</span><span class="n">_jvm</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="n">jmap</span> <span class="o">=</span> <span class="n">to_scala_map</span><span class="p">(</span><span class="n">jvm</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="n">_to_java_column</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">assignments</span><span class="o">.</span><span class="n">items</span><span class="p">()})</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_matched</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">jmap</span><span class="p">)</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">def</span> <span class="nf">delete</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to delete matched rows from the DataFrame.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_matched</span><span class="o">.</span><span class="n">delete</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">class</span> <span class="nc">WhenNotMatched</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> A class for defining actions to be taken when no matching rows are found in a DataFrame</span> |
| <span class="sd"> during a merge operation."""</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">writer</span><span class="p">:</span> <span class="s2">"MergeIntoWriter"</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Column</span><span class="p">]):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> <span class="o">=</span> <span class="n">writer</span> |
| <span class="k">if</span> <span class="n">condition</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">whenNotMatched</span><span class="p">()</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">whenNotMatched</span><span class="p">(</span><span class="n">_to_java_column</span><span class="p">(</span><span class="n">condition</span><span class="p">))</span> |
| |
| <span class="k">def</span> <span class="nf">insertAll</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to insert all non-matched rows into the DataFrame.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched</span><span class="o">.</span><span class="n">insertAll</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">def</span> <span class="nf">insert</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">assignments</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Column</span><span class="p">])</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to insert non-matched rows into the DataFrame with the provided</span> |
| <span class="sd"> column assignments.</span> |
| <span class="sd"> """</span> |
| <span class="n">jvm</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_spark</span><span class="o">.</span><span class="n">_jvm</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="n">jmap</span> <span class="o">=</span> <span class="n">to_scala_map</span><span class="p">(</span><span class="n">jvm</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="n">_to_java_column</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">assignments</span><span class="o">.</span><span class="n">items</span><span class="p">()})</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched</span><span class="o">.</span><span class="n">insert</span><span class="p">(</span><span class="n">jmap</span><span class="p">)</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">class</span> <span class="nc">WhenNotMatchedBySource</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> A class for defining actions to be performed when there is no match by source</span> |
| <span class="sd"> during a merge operation in a MergeIntoWriter.</span> |
| <span class="sd"> """</span> |
| |
| <span class="k">def</span> <span class="fm">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">writer</span><span class="p">:</span> <span class="s2">"MergeIntoWriter"</span><span class="p">,</span> <span class="n">condition</span><span class="p">:</span> <span class="n">Optional</span><span class="p">[</span><span class="n">Column</span><span class="p">]):</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> <span class="o">=</span> <span class="n">writer</span> |
| <span class="k">if</span> <span class="n">condition</span> <span class="ow">is</span> <span class="kc">None</span><span class="p">:</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched_by_source</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">whenNotMatchedBySource</span><span class="p">()</span> |
| <span class="k">else</span><span class="p">:</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched_by_source</span> <span class="o">=</span> <span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span><span class="o">.</span><span class="n">whenNotMatchedBySource</span><span class="p">(</span> |
| <span class="n">_to_java_column</span><span class="p">(</span><span class="n">condition</span><span class="p">)</span> |
| <span class="p">)</span> |
| |
| <span class="k">def</span> <span class="nf">updateAll</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to update all non-matched rows in the target DataFrame when</span> |
| <span class="sd"> not matched by the source.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched_by_source</span><span class="o">.</span><span class="n">updateAll</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">def</span> <span class="nf">update</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">assignments</span><span class="p">:</span> <span class="n">Dict</span><span class="p">[</span><span class="nb">str</span><span class="p">,</span> <span class="n">Column</span><span class="p">])</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to update non-matched rows in the target DataFrame with the provided</span> |
| <span class="sd"> column assignments when not matched by the source.</span> |
| <span class="sd"> """</span> |
| <span class="n">jvm</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_spark</span><span class="o">.</span><span class="n">_jvm</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql.classic.column</span> <span class="kn">import</span> <span class="n">_to_java_column</span> |
| |
| <span class="n">jmap</span> <span class="o">=</span> <span class="n">to_scala_map</span><span class="p">(</span><span class="n">jvm</span><span class="p">,</span> <span class="p">{</span><span class="n">k</span><span class="p">:</span> <span class="n">_to_java_column</span><span class="p">(</span><span class="n">v</span><span class="p">)</span> <span class="k">for</span> <span class="n">k</span><span class="p">,</span> <span class="n">v</span> <span class="ow">in</span> <span class="n">assignments</span><span class="o">.</span><span class="n">items</span><span class="p">()})</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched_by_source</span><span class="o">.</span><span class="n">update</span><span class="p">(</span><span class="n">jmap</span><span class="p">)</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| <span class="k">def</span> <span class="nf">delete</span><span class="p">(</span><span class="bp">self</span><span class="p">)</span> <span class="o">-></span> <span class="s2">"MergeIntoWriter"</span><span class="p">:</span> |
| <span class="w"> </span><span class="sd">"""</span> |
| <span class="sd"> Specifies an action to delete matched rows from the DataFrame.</span> |
| <span class="sd"> """</span> |
| <span class="bp">self</span><span class="o">.</span><span class="n">writer</span><span class="o">.</span><span class="n">_jwriter</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">when_not_matched_by_source</span><span class="o">.</span><span class="n">delete</span><span class="p">()</span> |
| <span class="k">return</span> <span class="bp">self</span><span class="o">.</span><span class="n">writer</span> |
| |
| |
| <span class="k">def</span> <span class="nf">_test</span><span class="p">()</span> <span class="o">-></span> <span class="kc">None</span><span class="p">:</span> |
| <span class="kn">import</span> <span class="nn">doctest</span> |
| <span class="kn">import</span> <span class="nn">os</span> |
| <span class="kn">import</span> <span class="nn">py4j</span> |
| <span class="kn">from</span> <span class="nn">pyspark.core.context</span> <span class="kn">import</span> <span class="n">SparkContext</span> |
| <span class="kn">from</span> <span class="nn">pyspark.sql</span> <span class="kn">import</span> <span class="n">SparkSession</span> |
| <span class="kn">import</span> <span class="nn">pyspark.sql.merge</span> |
| |
| <span class="n">os</span><span class="o">.</span><span class="n">chdir</span><span class="p">(</span><span class="n">os</span><span class="o">.</span><span class="n">environ</span><span class="p">[</span><span class="s2">"SPARK_HOME"</span><span class="p">])</span> |
| |
| <span class="n">globs</span> <span class="o">=</span> <span class="n">pyspark</span><span class="o">.</span><span class="n">sql</span><span class="o">.</span><span class="n">merge</span><span class="o">.</span><span class="vm">__dict__</span><span class="o">.</span><span class="n">copy</span><span class="p">()</span> |
| <span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="p">(</span><span class="s2">"local[4]"</span><span class="p">,</span> <span class="s2">"PythonTest"</span><span class="p">)</span> |
| <span class="k">try</span><span class="p">:</span> |
| <span class="n">spark</span> <span class="o">=</span> <span class="n">SparkSession</span><span class="o">.</span><span class="n">_getActiveSessionOrCreate</span><span class="p">()</span> |
| <span class="k">except</span> <span class="n">py4j</span><span class="o">.</span><span class="n">protocol</span><span class="o">.</span><span class="n">Py4JError</span><span class="p">:</span> |
| <span class="n">spark</span> <span class="o">=</span> <span class="n">SparkSession</span><span class="p">(</span><span class="n">sc</span><span class="p">)</span> |
| |
| <span class="n">globs</span><span class="p">[</span><span class="s2">"spark"</span><span class="p">]</span> <span class="o">=</span> <span class="n">spark</span> |
| <span class="p">(</span><span class="n">failure_count</span><span class="p">,</span> <span class="n">test_count</span><span class="p">)</span> <span class="o">=</span> <span class="n">doctest</span><span class="o">.</span><span class="n">testmod</span><span class="p">(</span> |
| <span class="n">pyspark</span><span class="o">.</span><span class="n">sql</span><span class="o">.</span><span class="n">merge</span><span class="p">,</span> |
| <span class="n">globs</span><span class="o">=</span><span class="n">globs</span><span class="p">,</span> |
| <span class="n">optionflags</span><span class="o">=</span><span class="n">doctest</span><span class="o">.</span><span class="n">ELLIPSIS</span> <span class="o">|</span> <span class="n">doctest</span><span class="o">.</span><span class="n">NORMALIZE_WHITESPACE</span> <span class="o">|</span> <span class="n">doctest</span><span class="o">.</span><span class="n">REPORT_NDIFF</span><span class="p">,</span> |
| <span class="p">)</span> |
| <span class="n">spark</span><span class="o">.</span><span class="n">stop</span><span class="p">()</span> |
| <span class="k">if</span> <span class="n">failure_count</span><span class="p">:</span> |
| <span class="n">sys</span><span class="o">.</span><span class="n">exit</span><span class="p">(</span><span class="o">-</span><span class="mi">1</span><span class="p">)</span> |
| |
| |
| <span class="k">if</span> <span class="vm">__name__</span> <span class="o">==</span> <span class="s2">"__main__"</span><span class="p">:</span> |
| <span class="n">_test</span><span class="p">()</span> |
| </pre></div> |
| |
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