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<h1>Source code for pyspark.sql.window</h1><div class="highlight"><pre>
<span class="c">#</span>
<span class="c"># Licensed to the Apache Software Foundation (ASF) under one or more</span>
<span class="c"># contributor license agreements. See the NOTICE file distributed with</span>
<span class="c"># this work for additional information regarding copyright ownership.</span>
<span class="c"># The ASF licenses this file to You under the Apache License, Version 2.0</span>
<span class="c"># (the "License"); you may not use this file except in compliance with</span>
<span class="c"># the License. You may obtain a copy of the License at</span>
<span class="c">#</span>
<span class="c"># http://www.apache.org/licenses/LICENSE-2.0</span>
<span class="c">#</span>
<span class="c"># Unless required by applicable law or agreed to in writing, software</span>
<span class="c"># distributed under the License is distributed on an "AS IS" BASIS,</span>
<span class="c"># WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span>
<span class="c"># See the License for the specific language governing permissions and</span>
<span class="c"># limitations under the License.</span>
<span class="c">#</span>
<span class="kn">import</span> <span class="nn">sys</span>
<span class="kn">from</span> <span class="nn">pyspark</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">since</span>
<span class="kn">from</span> <span class="nn">pyspark.sql.column</span> <span class="kn">import</span> <span class="n">_to_seq</span><span class="p">,</span> <span class="n">_to_java_column</span>
<span class="n">__all__</span> <span class="o">=</span> <span class="p">[</span><span class="s">"Window"</span><span class="p">,</span> <span class="s">"WindowSpec"</span><span class="p">]</span>
<span class="k">def</span> <span class="nf">_to_java_cols</span><span class="p">(</span><span class="n">cols</span><span class="p">):</span>
<span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
<span class="k">if</span> <span class="nb">len</span><span class="p">(</span><span class="n">cols</span><span class="p">)</span> <span class="o">==</span> <span class="mi">1</span> <span class="ow">and</span> <span class="nb">isinstance</span><span class="p">(</span><span class="n">cols</span><span class="p">[</span><span class="mi">0</span><span class="p">],</span> <span class="nb">list</span><span class="p">):</span>
<span class="n">cols</span> <span class="o">=</span> <span class="n">cols</span><span class="p">[</span><span class="mi">0</span><span class="p">]</span>
<span class="k">return</span> <span class="n">_to_seq</span><span class="p">(</span><span class="n">sc</span><span class="p">,</span> <span class="n">cols</span><span class="p">,</span> <span class="n">_to_java_column</span><span class="p">)</span>
<div class="viewcode-block" id="Window"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.Window">[docs]</a><span class="k">class</span> <span class="nc">Window</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Utility functions for defining window in DataFrames.</span>
<span class="sd"> For example:</span>
<span class="sd"> >>> # PARTITION BY country ORDER BY date ROWS BETWEEN UNBOUNDED PRECEDING AND CURRENT ROW</span>
<span class="sd"> >>> window = Window.partitionBy("country").orderBy("date").rowsBetween(-sys.maxsize, 0)</span>
<span class="sd"> >>> # PARTITION BY country ORDER BY date RANGE BETWEEN 3 PRECEDING AND 3 FOLLOWING</span>
<span class="sd"> >>> window = Window.orderBy("date").partitionBy("country").rangeBetween(-3, 3)</span>
<span class="sd"> .. note:: Experimental</span>
<span class="sd"> .. versionadded:: 1.4</span>
<span class="sd"> """</span>
<span class="nd">@staticmethod</span>
<span class="nd">@since</span><span class="p">(</span><span class="mf">1.4</span><span class="p">)</span>
<div class="viewcode-block" id="Window.partitionBy"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.Window.partitionBy">[docs]</a> <span class="k">def</span> <span class="nf">partitionBy</span><span class="p">(</span><span class="o">*</span><span class="n">cols</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Creates a :class:`WindowSpec` with the partitioning defined.</span>
<span class="sd"> """</span>
<span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
<span class="n">jspec</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</span><span class="o">.</span><span class="n">org</span><span class="o">.</span><span class="n">apache</span><span class="o">.</span><span class="n">spark</span><span class="o">.</span><span class="n">sql</span><span class="o">.</span><span class="n">expressions</span><span class="o">.</span><span class="n">Window</span><span class="o">.</span><span class="n">partitionBy</span><span class="p">(</span><span class="n">_to_java_cols</span><span class="p">(</span><span class="n">cols</span><span class="p">))</span>
<span class="k">return</span> <span class="n">WindowSpec</span><span class="p">(</span><span class="n">jspec</span><span class="p">)</span>
</div>
<span class="nd">@staticmethod</span>
<span class="nd">@since</span><span class="p">(</span><span class="mf">1.4</span><span class="p">)</span>
<div class="viewcode-block" id="Window.orderBy"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.Window.orderBy">[docs]</a> <span class="k">def</span> <span class="nf">orderBy</span><span class="p">(</span><span class="o">*</span><span class="n">cols</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Creates a :class:`WindowSpec` with the partitioning defined.</span>
<span class="sd"> """</span>
<span class="n">sc</span> <span class="o">=</span> <span class="n">SparkContext</span><span class="o">.</span><span class="n">_active_spark_context</span>
<span class="n">jspec</span> <span class="o">=</span> <span class="n">sc</span><span class="o">.</span><span class="n">_jvm</span><span class="o">.</span><span class="n">org</span><span class="o">.</span><span class="n">apache</span><span class="o">.</span><span class="n">spark</span><span class="o">.</span><span class="n">sql</span><span class="o">.</span><span class="n">expressions</span><span class="o">.</span><span class="n">Window</span><span class="o">.</span><span class="n">orderBy</span><span class="p">(</span><span class="n">_to_java_cols</span><span class="p">(</span><span class="n">cols</span><span class="p">))</span>
<span class="k">return</span> <span class="n">WindowSpec</span><span class="p">(</span><span class="n">jspec</span><span class="p">)</span>
</div></div>
<div class="viewcode-block" id="WindowSpec"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.WindowSpec">[docs]</a><span class="k">class</span> <span class="nc">WindowSpec</span><span class="p">(</span><span class="nb">object</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> A window specification that defines the partitioning, ordering,</span>
<span class="sd"> and frame boundaries.</span>
<span class="sd"> Use the static methods in :class:`Window` to create a :class:`WindowSpec`.</span>
<span class="sd"> .. note:: Experimental</span>
<span class="sd"> .. versionadded:: 1.4</span>
<span class="sd"> """</span>
<span class="n">_JAVA_MAX_LONG</span> <span class="o">=</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">63</span><span class="p">)</span> <span class="o">-</span> <span class="mi">1</span>
<span class="n">_JAVA_MIN_LONG</span> <span class="o">=</span> <span class="o">-</span> <span class="p">(</span><span class="mi">1</span> <span class="o"><<</span> <span class="mi">63</span><span class="p">)</span>
<span class="k">def</span> <span class="nf">__init__</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">jspec</span><span class="p">):</span>
<span class="bp">self</span><span class="o">.</span><span class="n">_jspec</span> <span class="o">=</span> <span class="n">jspec</span>
<span class="nd">@since</span><span class="p">(</span><span class="mf">1.4</span><span class="p">)</span>
<div class="viewcode-block" id="WindowSpec.partitionBy"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.WindowSpec.partitionBy">[docs]</a> <span class="k">def</span> <span class="nf">partitionBy</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">cols</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Defines the partitioning columns in a :class:`WindowSpec`.</span>
<span class="sd"> :param cols: names of columns or expressions</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">WindowSpec</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_jspec</span><span class="o">.</span><span class="n">partitionBy</span><span class="p">(</span><span class="n">_to_java_cols</span><span class="p">(</span><span class="n">cols</span><span class="p">)))</span>
</div>
<span class="nd">@since</span><span class="p">(</span><span class="mf">1.4</span><span class="p">)</span>
<div class="viewcode-block" id="WindowSpec.orderBy"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.WindowSpec.orderBy">[docs]</a> <span class="k">def</span> <span class="nf">orderBy</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="o">*</span><span class="n">cols</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Defines the ordering columns in a :class:`WindowSpec`.</span>
<span class="sd"> :param cols: names of columns or expressions</span>
<span class="sd"> """</span>
<span class="k">return</span> <span class="n">WindowSpec</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_jspec</span><span class="o">.</span><span class="n">orderBy</span><span class="p">(</span><span class="n">_to_java_cols</span><span class="p">(</span><span class="n">cols</span><span class="p">)))</span>
</div>
<span class="nd">@since</span><span class="p">(</span><span class="mf">1.4</span><span class="p">)</span>
<div class="viewcode-block" id="WindowSpec.rowsBetween"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.WindowSpec.rowsBetween">[docs]</a> <span class="k">def</span> <span class="nf">rowsBetween</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">start</span><span class="p">,</span> <span class="n">end</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Defines the frame boundaries, from `start` (inclusive) to `end` (inclusive).</span>
<span class="sd"> Both `start` and `end` are relative positions from the current row.</span>
<span class="sd"> For example, "0" means "current row", while "-1" means the row before</span>
<span class="sd"> the current row, and "5" means the fifth row after the current row.</span>
<span class="sd"> :param start: boundary start, inclusive.</span>
<span class="sd"> The frame is unbounded if this is ``-sys.maxsize`` (or lower).</span>
<span class="sd"> :param end: boundary end, inclusive.</span>
<span class="sd"> The frame is unbounded if this is ``sys.maxsize`` (or higher).</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">start</span> <span class="o"><=</span> <span class="o">-</span><span class="n">sys</span><span class="o">.</span><span class="n">maxsize</span><span class="p">:</span>
<span class="n">start</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_JAVA_MIN_LONG</span>
<span class="k">if</span> <span class="n">end</span> <span class="o">>=</span> <span class="n">sys</span><span class="o">.</span><span class="n">maxsize</span><span class="p">:</span>
<span class="n">end</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_JAVA_MAX_LONG</span>
<span class="k">return</span> <span class="n">WindowSpec</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_jspec</span><span class="o">.</span><span class="n">rowsBetween</span><span class="p">(</span><span class="n">start</span><span class="p">,</span> <span class="n">end</span><span class="p">))</span>
</div>
<span class="nd">@since</span><span class="p">(</span><span class="mf">1.4</span><span class="p">)</span>
<div class="viewcode-block" id="WindowSpec.rangeBetween"><a class="viewcode-back" href="../../../pyspark.sql.html#pyspark.sql.WindowSpec.rangeBetween">[docs]</a> <span class="k">def</span> <span class="nf">rangeBetween</span><span class="p">(</span><span class="bp">self</span><span class="p">,</span> <span class="n">start</span><span class="p">,</span> <span class="n">end</span><span class="p">):</span>
<span class="sd">"""</span>
<span class="sd"> Defines the frame boundaries, from `start` (inclusive) to `end` (inclusive).</span>
<span class="sd"> Both `start` and `end` are relative from the current row. For example,</span>
<span class="sd"> "0" means "current row", while "-1" means one off before the current row,</span>
<span class="sd"> and "5" means the five off after the current row.</span>
<span class="sd"> :param start: boundary start, inclusive.</span>
<span class="sd"> The frame is unbounded if this is ``-sys.maxsize`` (or lower).</span>
<span class="sd"> :param end: boundary end, inclusive.</span>
<span class="sd"> The frame is unbounded if this is ``sys.maxsize`` (or higher).</span>
<span class="sd"> """</span>
<span class="k">if</span> <span class="n">start</span> <span class="o"><=</span> <span class="o">-</span><span class="n">sys</span><span class="o">.</span><span class="n">maxsize</span><span class="p">:</span>
<span class="n">start</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_JAVA_MIN_LONG</span>
<span class="k">if</span> <span class="n">end</span> <span class="o">>=</span> <span class="n">sys</span><span class="o">.</span><span class="n">maxsize</span><span class="p">:</span>
<span class="n">end</span> <span class="o">=</span> <span class="bp">self</span><span class="o">.</span><span class="n">_JAVA_MAX_LONG</span>
<span class="k">return</span> <span class="n">WindowSpec</span><span class="p">(</span><span class="bp">self</span><span class="o">.</span><span class="n">_jspec</span><span class="o">.</span><span class="n">rangeBetween</span><span class="p">(</span><span class="n">start</span><span class="p">,</span> <span class="n">end</span><span class="p">))</span>
</div></div>
<span class="k">def</span> <span class="nf">_test</span><span class="p">():</span>
<span class="kn">import</span> <span class="nn">doctest</span>
<span class="n">SparkContext</span><span class="p">(</span><span class="s">'local[4]'</span><span class="p">,</span> <span class="s">'PythonTest'</span><span class="p">)</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="k">if</span> <span class="n">failure_count</span><span class="p">:</span>
<span class="nb">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="n">__name__</span> <span class="o">==</span> <span class="s">"__main__"</span><span class="p">:</span>
<span class="n">_test</span><span class="p">()</span>
</pre></div>
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