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<div class="title">parquet-reader.cc</div> </div>
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<a href="parquet-reader_8cc.html">Go to the documentation of this file.</a><div class="fragment"><div class="line"><a name="l00001"></a><span class="lineno"> 1</span>&#160;<span class="comment">// Copyright 2012 Cloudera Inc.</span></div>
<div class="line"><a name="l00002"></a><span class="lineno"> 2</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00003"></a><span class="lineno"> 3</span>&#160;<span class="comment">// Licensed under the Apache License, Version 2.0 (the &quot;License&quot;);</span></div>
<div class="line"><a name="l00004"></a><span class="lineno"> 4</span>&#160;<span class="comment">// you may not use this file except in compliance with the License.</span></div>
<div class="line"><a name="l00005"></a><span class="lineno"> 5</span>&#160;<span class="comment">// You may obtain a copy of the License at</span></div>
<div class="line"><a name="l00006"></a><span class="lineno"> 6</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00007"></a><span class="lineno"> 7</span>&#160;<span class="comment">// http://www.apache.org/licenses/LICENSE-2.0</span></div>
<div class="line"><a name="l00008"></a><span class="lineno"> 8</span>&#160;<span class="comment">//</span></div>
<div class="line"><a name="l00009"></a><span class="lineno"> 9</span>&#160;<span class="comment">// Unless required by applicable law or agreed to in writing, software</span></div>
<div class="line"><a name="l00010"></a><span class="lineno"> 10</span>&#160;<span class="comment">// distributed under the License is distributed on an &quot;AS IS&quot; BASIS,</span></div>
<div class="line"><a name="l00011"></a><span class="lineno"> 11</span>&#160;<span class="comment">// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.</span></div>
<div class="line"><a name="l00012"></a><span class="lineno"> 12</span>&#160;<span class="comment">// See the License for the specific language governing permissions and</span></div>
<div class="line"><a name="l00013"></a><span class="lineno"> 13</span>&#160;<span class="comment">// limitations under the License.</span></div>
<div class="line"><a name="l00014"></a><span class="lineno"> 14</span>&#160;</div>
<div class="line"><a name="l00015"></a><span class="lineno"> 15</span>&#160;<span class="preprocessor">#include &lt;iostream&gt;</span></div>
<div class="line"><a name="l00016"></a><span class="lineno"> 16</span>&#160;<span class="preprocessor">#include &lt;sstream&gt;</span></div>
<div class="line"><a name="l00017"></a><span class="lineno"> 17</span>&#160;<span class="preprocessor">#include &lt;vector&gt;</span></div>
<div class="line"><a name="l00018"></a><span class="lineno"> 18</span>&#160;<span class="preprocessor">#include &lt;gflags/gflags.h&gt;</span></div>
<div class="line"><a name="l00019"></a><span class="lineno"> 19</span>&#160;<span class="preprocessor">#include &lt;snappy.h&gt;</span></div>
<div class="line"><a name="l00020"></a><span class="lineno"> 20</span>&#160;<span class="preprocessor">#include &quot;gen-cpp/parquet_types.h&quot;</span></div>
<div class="line"><a name="l00021"></a><span class="lineno"> 21</span>&#160;</div>
<div class="line"><a name="l00022"></a><span class="lineno"> 22</span>&#160;<span class="comment">// TCompactProtocol requires some #defines to work right.</span></div>
<div class="line"><a name="l00023"></a><span class="lineno"> 23</span>&#160;<span class="comment">// TODO: is there a better include to use?</span></div>
<div class="line"><a name="l00024"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#a8ca580c706c40d1afdc66817fc7e1b2d"> 24</a></span>&#160;<span class="preprocessor">#define SIGNED_RIGHT_SHIFT_IS 1</span></div>
<div class="line"><a name="l00025"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#abff73164116e627543a6fed8679b0205"> 25</a></span>&#160;<span class="preprocessor"></span><span class="preprocessor">#define ARITHMETIC_RIGHT_SHIFT 1</span></div>
<div class="line"><a name="l00026"></a><span class="lineno"> 26</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#pragma clang diagnostic push</span></div>
<div class="line"><a name="l00027"></a><span class="lineno"> 27</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#pragma clang diagnostic ignored &quot;-Wstring-plus-int&quot;</span></div>
<div class="line"><a name="l00028"></a><span class="lineno"> 28</span>&#160;<span class="preprocessor"></span><span class="preprocessor">#include &lt;thrift/protocol/TCompactProtocol.h&gt;</span></div>
<div class="line"><a name="l00029"></a><span class="lineno"> 29</span>&#160;<span class="preprocessor">#include &lt;thrift/protocol/TBinaryProtocol.h&gt;</span></div>
<div class="line"><a name="l00030"></a><span class="lineno"> 30</span>&#160;<span class="preprocessor">#include &lt;thrift/protocol/TDebugProtocol.h&gt;</span></div>
<div class="line"><a name="l00031"></a><span class="lineno"> 31</span>&#160;<span class="preprocessor">#include &lt;thrift/TApplicationException.h&gt;</span></div>
<div class="line"><a name="l00032"></a><span class="lineno"> 32</span>&#160;<span class="preprocessor">#include &lt;thrift/transport/TBufferTransports.h&gt;</span></div>
<div class="line"><a name="l00033"></a><span class="lineno"> 33</span>&#160;<span class="preprocessor">#pragma clang diagnostic pop</span></div>
<div class="line"><a name="l00034"></a><span class="lineno"> 34</span>&#160;<span class="preprocessor"></span></div>
<div class="line"><a name="l00035"></a><span class="lineno"> 35</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="rle-encoding_8h.html">util/rle-encoding.h</a>&quot;</span></div>
<div class="line"><a name="l00036"></a><span class="lineno"> 36</span>&#160;</div>
<div class="line"><a name="l00037"></a><span class="lineno"> 37</span>&#160;<span class="preprocessor">#include &quot;<a class="code" href="names_8h.html">common/names.h</a>&quot;</span></div>
<div class="line"><a name="l00038"></a><span class="lineno"> 38</span>&#160;</div>
<div class="line"><a name="l00039"></a><span class="lineno"> 39</span>&#160;<a class="code" href="parquet-reader_8cc.html#a4df732d428eebaa92b4ffe085517e7a3">DEFINE_string</a>(file, <span class="stringliteral">&quot;&quot;</span>, <span class="stringliteral">&quot;File to read&quot;</span>);</div>
<div class="line"><a name="l00040"></a><span class="lineno"> 40</span>&#160;<a class="code" href="parquet-reader_8cc.html#a46bd6e83878a6ed362f1d029446ded03">DEFINE_bool</a>(output_page_header, <span class="keyword">false</span>, <span class="stringliteral">&quot;If true, output page headers to stderr.&quot;</span>);</div>
<div class="line"><a name="l00041"></a><span class="lineno"> 41</span>&#160;</div>
<div class="line"><a name="l00042"></a><span class="lineno"> 42</span>&#160;<span class="keyword">using namespace </span><a class="code" href="namespaceimpala.html#a8cf06290ff145eec23570a8b9790f412">apache::thrift::protocol</a>;</div>
<div class="line"><a name="l00043"></a><span class="lineno"> 43</span>&#160;<span class="keyword">using namespace </span>apache::thrift::transport;</div>
<div class="line"><a name="l00044"></a><span class="lineno"> 44</span>&#160;<span class="keyword">using namespace </span>apache::thrift;</div>
<div class="line"><a name="l00045"></a><span class="lineno"> 45</span>&#160;<span class="keyword">using namespace </span>parquet;</div>
<div class="line"><a name="l00046"></a><span class="lineno"> 46</span>&#160;<span class="keyword">using</span> std::min;</div>
<div class="line"><a name="l00047"></a><span class="lineno"> 47</span>&#160;</div>
<div class="line"><a name="l00048"></a><span class="lineno"> 48</span>&#160;<span class="comment">// Some code is replicated to make this more stand-alone.</span></div>
<div class="line"><a name="l00049"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982"> 49</a></span>&#160;<span class="keyword">const</span> uint8_t <a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>[] = {<span class="charliteral">&#39;P&#39;</span>, <span class="charliteral">&#39;A&#39;</span>, <span class="charliteral">&#39;R&#39;</span>, <span class="charliteral">&#39;1&#39;</span>};</div>
<div class="line"><a name="l00050"></a><span class="lineno"> 50</span>&#160;</div>
<div class="line"><a name="l00051"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#a35f3b2e28fff4bc3e1ae6733a834eb45"> 51</a></span>&#160;shared_ptr&lt;TProtocol&gt; <a class="code" href="parquet-reader_8cc.html#a35f3b2e28fff4bc3e1ae6733a834eb45">CreateDeserializeProtocol</a>(</div>
<div class="line"><a name="l00052"></a><span class="lineno"> 52</span>&#160; shared_ptr&lt;TMemoryBuffer&gt; mem, <span class="keywordtype">bool</span> compact) {</div>
<div class="line"><a name="l00053"></a><span class="lineno"> 53</span>&#160; <span class="keywordflow">if</span> (compact) {</div>
<div class="line"><a name="l00054"></a><span class="lineno"> 54</span>&#160; TCompactProtocolFactoryT&lt;TMemoryBuffer&gt; tproto_factory;</div>
<div class="line"><a name="l00055"></a><span class="lineno"> 55</span>&#160; <span class="keywordflow">return</span> tproto_factory.getProtocol(mem);</div>
<div class="line"><a name="l00056"></a><span class="lineno"> 56</span>&#160; } <span class="keywordflow">else</span> {</div>
<div class="line"><a name="l00057"></a><span class="lineno"> 57</span>&#160; TBinaryProtocolFactoryT&lt;TMemoryBuffer&gt; tproto_factory;</div>
<div class="line"><a name="l00058"></a><span class="lineno"> 58</span>&#160; <span class="keywordflow">return</span> tproto_factory.getProtocol(mem);</div>
<div class="line"><a name="l00059"></a><span class="lineno"> 59</span>&#160; }</div>
<div class="line"><a name="l00060"></a><span class="lineno"> 60</span>&#160;}</div>
<div class="line"><a name="l00061"></a><span class="lineno"> 61</span>&#160;</div>
<div class="line"><a name="l00062"></a><span class="lineno"> 62</span>&#160;<span class="comment">// Deserialize a thrift message from buf/len. buf/len must at least contain</span></div>
<div class="line"><a name="l00063"></a><span class="lineno"> 63</span>&#160;<span class="comment">// all the bytes needed to store the thrift message. On return, len will be</span></div>
<div class="line"><a name="l00064"></a><span class="lineno"> 64</span>&#160;<span class="comment">// set to the actual length of the header.</span></div>
<div class="line"><a name="l00065"></a><span class="lineno"> 65</span>&#160;<span class="keyword">template</span> &lt;<span class="keyword">class</span> T&gt;</div>
<div class="line"><a name="l00066"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#ad53afba3f369cbf9749e3d4d3a9e841a"> 66</a></span>&#160;<span class="keywordtype">bool</span> <a class="code" href="parquet-reader_8cc.html#ad53afba3f369cbf9749e3d4d3a9e841a">DeserializeThriftMsg</a>(uint8_t* buf, uint32_t* len, <span class="keywordtype">bool</span> compact,</div>
<div class="line"><a name="l00067"></a><span class="lineno"> 67</span>&#160; T* deserialized_msg) {</div>
<div class="line"><a name="l00068"></a><span class="lineno"> 68</span>&#160; <span class="comment">// Deserialize msg bytes into c++ thrift msg using memory transport.</span></div>
<div class="line"><a name="l00069"></a><span class="lineno"> 69</span>&#160; shared_ptr&lt;TMemoryBuffer&gt; tmem_transport(<span class="keyword">new</span> TMemoryBuffer(buf, *len));</div>
<div class="line"><a name="l00070"></a><span class="lineno"> 70</span>&#160; shared_ptr&lt;TProtocol&gt; tproto = <a class="code" href="parquet-reader_8cc.html#a35f3b2e28fff4bc3e1ae6733a834eb45">CreateDeserializeProtocol</a>(tmem_transport, compact);</div>
<div class="line"><a name="l00071"></a><span class="lineno"> 71</span>&#160; <span class="keywordflow">try</span> {</div>
<div class="line"><a name="l00072"></a><span class="lineno"> 72</span>&#160; deserialized_msg-&gt;read(tproto.get());</div>
<div class="line"><a name="l00073"></a><span class="lineno"> 73</span>&#160; } <span class="keywordflow">catch</span> (apache::thrift::protocol::TProtocolException&amp; e) {</div>
<div class="line"><a name="l00074"></a><span class="lineno"> 74</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot;couldn&#39;t deserialize thrift msg:\n&quot;</span> &lt;&lt; e.what() &lt;&lt; endl;</div>
<div class="line"><a name="l00075"></a><span class="lineno"> 75</span>&#160; <span class="keywordflow">return</span> <span class="keyword">false</span>;</div>
<div class="line"><a name="l00076"></a><span class="lineno"> 76</span>&#160; }</div>
<div class="line"><a name="l00077"></a><span class="lineno"> 77</span>&#160; uint32_t bytes_left = tmem_transport-&gt;available_read();</div>
<div class="line"><a name="l00078"></a><span class="lineno"> 78</span>&#160; *len = *len - bytes_left;</div>
<div class="line"><a name="l00079"></a><span class="lineno"> 79</span>&#160; <span class="keywordflow">return</span> <span class="keyword">true</span>;</div>
<div class="line"><a name="l00080"></a><span class="lineno"> 80</span>&#160;}</div>
<div class="line"><a name="l00081"></a><span class="lineno"> 81</span>&#160;</div>
<div class="line"><a name="l00082"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#addbff50e6868726f2aac6d6b5468e1ed"> 82</a></span>&#160;<span class="keywordtype">string</span> <a class="code" href="parquet-reader_8cc.html#addbff50e6868726f2aac6d6b5468e1ed">TypeMapping</a>(Type::type t) {</div>
<div class="line"><a name="l00083"></a><span class="lineno"> 83</span>&#160; <span class="keywordflow">switch</span> (t) {</div>
<div class="line"><a name="l00084"></a><span class="lineno"> 84</span>&#160; <span class="keywordflow">case</span> Type::BOOLEAN:</div>
<div class="line"><a name="l00085"></a><span class="lineno"> 85</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;BOOLEAN&quot;</span>;</div>
<div class="line"><a name="l00086"></a><span class="lineno"> 86</span>&#160; <span class="keywordflow">case</span> Type::INT32:</div>
<div class="line"><a name="l00087"></a><span class="lineno"> 87</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;INT32&quot;</span>;</div>
<div class="line"><a name="l00088"></a><span class="lineno"> 88</span>&#160; <span class="keywordflow">case</span> Type::INT64:</div>
<div class="line"><a name="l00089"></a><span class="lineno"> 89</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;INT64&quot;</span>;</div>
<div class="line"><a name="l00090"></a><span class="lineno"> 90</span>&#160; <span class="keywordflow">case</span> Type::FLOAT:</div>
<div class="line"><a name="l00091"></a><span class="lineno"> 91</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;FLOAT&quot;</span>;</div>
<div class="line"><a name="l00092"></a><span class="lineno"> 92</span>&#160; <span class="keywordflow">case</span> Type::DOUBLE:</div>
<div class="line"><a name="l00093"></a><span class="lineno"> 93</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;DOUBLE&quot;</span>;</div>
<div class="line"><a name="l00094"></a><span class="lineno"> 94</span>&#160; <span class="keywordflow">case</span> Type::BYTE_ARRAY:</div>
<div class="line"><a name="l00095"></a><span class="lineno"> 95</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;BYTE_ARRAY&quot;</span>;</div>
<div class="line"><a name="l00096"></a><span class="lineno"> 96</span>&#160; <span class="keywordflow">default</span>:</div>
<div class="line"><a name="l00097"></a><span class="lineno"> 97</span>&#160; <span class="keywordflow">return</span> <span class="stringliteral">&quot;UNKNOWN&quot;</span>;</div>
<div class="line"><a name="l00098"></a><span class="lineno"> 98</span>&#160; }</div>
<div class="line"><a name="l00099"></a><span class="lineno"> 99</span>&#160;}</div>
<div class="line"><a name="l00100"></a><span class="lineno"> 100</span>&#160;</div>
<div class="line"><a name="l00101"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#aaacbca5eda3de7c4b1afd6e0d11470ec"> 101</a></span>&#160;<span class="keywordtype">void</span> <a class="code" href="parquet-reader_8cc.html#aaacbca5eda3de7c4b1afd6e0d11470ec">AppendSchema</a>(<span class="keyword">const</span> vector&lt;SchemaElement&gt;&amp; schema, <span class="keywordtype">int</span> level,</div>
<div class="line"><a name="l00102"></a><span class="lineno"> 102</span>&#160; <span class="keywordtype">int</span>* <a class="code" href="namespacegen__ir__descriptions.html#a0d6572990c8dd576a55a21ff11d6deb7">idx</a>, stringstream* ss) {</div>
<div class="line"><a name="l00103"></a><span class="lineno"> 103</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; level; ++i) {</div>
<div class="line"><a name="l00104"></a><span class="lineno"> 104</span>&#160; (*ss) &lt;&lt; <span class="stringliteral">&quot; &quot;</span>;</div>
<div class="line"><a name="l00105"></a><span class="lineno"> 105</span>&#160; }</div>
<div class="line"><a name="l00106"></a><span class="lineno"> 106</span>&#160; (*ss) &lt;&lt; schema[*<a class="code" href="namespacegen__ir__descriptions.html#a0d6572990c8dd576a55a21ff11d6deb7">idx</a>].name;</div>
<div class="line"><a name="l00107"></a><span class="lineno"> 107</span>&#160; <span class="keywordflow">if</span> (schema[*idx].__isset.type) (*ss) &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <a class="code" href="parquet-reader_8cc.html#addbff50e6868726f2aac6d6b5468e1ed">TypeMapping</a>(schema[*idx].type);</div>
<div class="line"><a name="l00108"></a><span class="lineno"> 108</span>&#160; (*ss) &lt;&lt; endl;</div>
<div class="line"><a name="l00109"></a><span class="lineno"> 109</span>&#160;</div>
<div class="line"><a name="l00110"></a><span class="lineno"> 110</span>&#160; <span class="keywordtype">int</span> num_children = schema[*<a class="code" href="namespacegen__ir__descriptions.html#a0d6572990c8dd576a55a21ff11d6deb7">idx</a>].num_children;</div>
<div class="line"><a name="l00111"></a><span class="lineno"> 111</span>&#160; ++*<a class="code" href="namespacegen__ir__descriptions.html#a0d6572990c8dd576a55a21ff11d6deb7">idx</a>;</div>
<div class="line"><a name="l00112"></a><span class="lineno"> 112</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; num_children; ++i) {</div>
<div class="line"><a name="l00113"></a><span class="lineno"> 113</span>&#160; <a class="code" href="parquet-reader_8cc.html#aaacbca5eda3de7c4b1afd6e0d11470ec">AppendSchema</a>(schema, level + 1, idx, ss);</div>
<div class="line"><a name="l00114"></a><span class="lineno"> 114</span>&#160; }</div>
<div class="line"><a name="l00115"></a><span class="lineno"> 115</span>&#160;}</div>
<div class="line"><a name="l00116"></a><span class="lineno"> 116</span>&#160;</div>
<div class="line"><a name="l00117"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#ada76d38004c85c6b85ad83161f7b9545"> 117</a></span>&#160;<span class="keywordtype">string</span> <a class="code" href="parquet-reader_8cc.html#ada76d38004c85c6b85ad83161f7b9545">GetSchema</a>(<span class="keyword">const</span> FileMetaData&amp; md) {</div>
<div class="line"><a name="l00118"></a><span class="lineno"> 118</span>&#160; <span class="keyword">const</span> vector&lt;SchemaElement&gt;&amp; schema = md.schema;</div>
<div class="line"><a name="l00119"></a><span class="lineno"> 119</span>&#160; <span class="keywordflow">if</span> (schema.empty()) <span class="keywordflow">return</span> <span class="stringliteral">&quot;Invalid schema&quot;</span>;</div>
<div class="line"><a name="l00120"></a><span class="lineno"> 120</span>&#160; <span class="keywordtype">int</span> num_root_elements = schema[0].num_children;</div>
<div class="line"><a name="l00121"></a><span class="lineno"> 121</span>&#160; stringstream ss;</div>
<div class="line"><a name="l00122"></a><span class="lineno"> 122</span>&#160; <span class="keywordtype">int</span> <a class="code" href="namespacegen__ir__descriptions.html#a0d6572990c8dd576a55a21ff11d6deb7">idx</a> = 1;</div>
<div class="line"><a name="l00123"></a><span class="lineno"> 123</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; num_root_elements; ++i) {</div>
<div class="line"><a name="l00124"></a><span class="lineno"> 124</span>&#160; <a class="code" href="parquet-reader_8cc.html#aaacbca5eda3de7c4b1afd6e0d11470ec">AppendSchema</a>(schema, 0, &amp;idx, &amp;ss);</div>
<div class="line"><a name="l00125"></a><span class="lineno"> 125</span>&#160; }</div>
<div class="line"><a name="l00126"></a><span class="lineno"> 126</span>&#160; <span class="keywordflow">return</span> ss.str();</div>
<div class="line"><a name="l00127"></a><span class="lineno"> 127</span>&#160;}</div>
<div class="line"><a name="l00128"></a><span class="lineno"> 128</span>&#160;</div>
<div class="line"><a name="l00129"></a><span class="lineno"> 129</span>&#160;<span class="comment">// Simple utility to read parquet files on local disk. This utility validates the</span></div>
<div class="line"><a name="l00130"></a><span class="lineno"> 130</span>&#160;<span class="comment">// file is correctly formed and can output values from each data page. The</span></div>
<div class="line"><a name="l00131"></a><span class="lineno"> 131</span>&#160;<span class="comment">// entire file is buffered in memory so this is not suitable for very large files.</span></div>
<div class="line"><a name="l00132"></a><span class="lineno"> 132</span>&#160;<span class="comment">// We expect the table to be split into multiple parquet files, each the size of</span></div>
<div class="line"><a name="l00133"></a><span class="lineno"> 133</span>&#160;<span class="comment">// a HDFS block, in which case this utility will be able to able to handle it.</span></div>
<div class="line"><a name="l00134"></a><span class="lineno"> 134</span>&#160;<span class="comment">// cerr is used to output diagnostics of the file</span></div>
<div class="line"><a name="l00135"></a><span class="lineno"> 135</span>&#160;<span class="comment">// cout is used to output converted data (in csv)</span></div>
<div class="line"><a name="l00136"></a><span class="lineno"><a class="line" href="parquet-reader_8cc.html#a3c04138a5bfe5d72780bb7e82a18e627"> 136</a></span>&#160;<span class="keywordtype">int</span> <a class="code" href="parquet-reader_8cc.html#a3c04138a5bfe5d72780bb7e82a18e627">main</a>(<span class="keywordtype">int</span> argc, <span class="keywordtype">char</span>** argv) {</div>
<div class="line"><a name="l00137"></a><span class="lineno"> 137</span>&#160; google::ParseCommandLineFlags(&amp;argc, &amp;argv, <span class="keyword">true</span>);</div>
<div class="line"><a name="l00138"></a><span class="lineno"> 138</span>&#160;</div>
<div class="line"><a name="l00139"></a><span class="lineno"> 139</span>&#160; <span class="keywordflow">if</span> (FLAGS_file.size() == 0) {</div>
<div class="line"><a name="l00140"></a><span class="lineno"> 140</span>&#160; cout &lt;&lt; <span class="stringliteral">&quot;Must specify input file.&quot;</span> &lt;&lt; endl;</div>
<div class="line"><a name="l00141"></a><span class="lineno"> 141</span>&#160; <span class="keywordflow">return</span> -1;</div>
<div class="line"><a name="l00142"></a><span class="lineno"> 142</span>&#160; }</div>
<div class="line"><a name="l00143"></a><span class="lineno"> 143</span>&#160;</div>
<div class="line"><a name="l00144"></a><span class="lineno"> 144</span>&#160; FILE* file = fopen(FLAGS_file.c_str(), <span class="stringliteral">&quot;r&quot;</span>);</div>
<div class="line"><a name="l00145"></a><span class="lineno"> 145</span>&#160; assert(file != NULL);</div>
<div class="line"><a name="l00146"></a><span class="lineno"> 146</span>&#160;</div>
<div class="line"><a name="l00147"></a><span class="lineno"> 147</span>&#160; fseek(file, 0L, SEEK_END);</div>
<div class="line"><a name="l00148"></a><span class="lineno"> 148</span>&#160; <span class="keywordtype">size_t</span> file_len = ftell(file);</div>
<div class="line"><a name="l00149"></a><span class="lineno"> 149</span>&#160; fseek(file, 0L, SEEK_SET);</div>
<div class="line"><a name="l00150"></a><span class="lineno"> 150</span>&#160;</div>
<div class="line"><a name="l00151"></a><span class="lineno"> 151</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot;File Length: &quot;</span> &lt;&lt; file_len &lt;&lt; endl;</div>
<div class="line"><a name="l00152"></a><span class="lineno"> 152</span>&#160;</div>
<div class="line"><a name="l00153"></a><span class="lineno"> 153</span>&#160; uint8_t* buffer = <span class="keyword">reinterpret_cast&lt;</span>uint8_t*<span class="keyword">&gt;</span>(malloc(file_len));</div>
<div class="line"><a name="l00154"></a><span class="lineno"> 154</span>&#160; <span class="keywordtype">size_t</span> bytes_read = fread(buffer, 1, file_len, file);</div>
<div class="line"><a name="l00155"></a><span class="lineno"> 155</span>&#160; assert(bytes_read == file_len);</div>
<div class="line"><a name="l00156"></a><span class="lineno"> 156</span>&#160;</div>
<div class="line"><a name="l00157"></a><span class="lineno"> 157</span>&#160; <span class="comment">// Check file starts and ends with magic bytes</span></div>
<div class="line"><a name="l00158"></a><span class="lineno"> 158</span>&#160; assert(</div>
<div class="line"><a name="l00159"></a><span class="lineno"> 159</span>&#160; memcmp(buffer, <a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>, <span class="keyword">sizeof</span>(<a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>)) == 0);</div>
<div class="line"><a name="l00160"></a><span class="lineno"> 160</span>&#160; assert(memcmp(buffer + file_len - <span class="keyword">sizeof</span>(<a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>),</div>
<div class="line"><a name="l00161"></a><span class="lineno"> 161</span>&#160; <a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>, <span class="keyword">sizeof</span>(<a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>)) == 0);</div>
<div class="line"><a name="l00162"></a><span class="lineno"> 162</span>&#160;</div>
<div class="line"><a name="l00163"></a><span class="lineno"> 163</span>&#160; <span class="comment">// Get metadata</span></div>
<div class="line"><a name="l00164"></a><span class="lineno"> 164</span>&#160; uint8_t* metadata_len_ptr =</div>
<div class="line"><a name="l00165"></a><span class="lineno"> 165</span>&#160; buffer + file_len - <span class="keyword">sizeof</span>(<a class="code" href="parquet-reader_8cc.html#a5f888f81f6419bb07cd3aeccc49b8982">PARQUET_VERSION_NUMBER</a>) - <span class="keyword">sizeof</span>(uint32_t);</div>
<div class="line"><a name="l00166"></a><span class="lineno"> 166</span>&#160; uint32_t metadata_len = *<span class="keyword">reinterpret_cast&lt;</span>uint32_t*<span class="keyword">&gt;</span>(metadata_len_ptr);</div>
<div class="line"><a name="l00167"></a><span class="lineno"> 167</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot;Metadata len: &quot;</span> &lt;&lt; metadata_len &lt;&lt; endl;</div>
<div class="line"><a name="l00168"></a><span class="lineno"> 168</span>&#160;</div>
<div class="line"><a name="l00169"></a><span class="lineno"> 169</span>&#160; uint8_t* metadata = metadata_len_ptr - metadata_len;</div>
<div class="line"><a name="l00170"></a><span class="lineno"> 170</span>&#160;</div>
<div class="line"><a name="l00171"></a><span class="lineno"> 171</span>&#160; FileMetaData file_metadata;</div>
<div class="line"><a name="l00172"></a><span class="lineno"> 172</span>&#160; <span class="keywordtype">bool</span> status = <a class="code" href="parquet-reader_8cc.html#ad53afba3f369cbf9749e3d4d3a9e841a">DeserializeThriftMsg</a>(metadata, &amp;metadata_len, <span class="keyword">true</span>, &amp;file_metadata);</div>
<div class="line"><a name="l00173"></a><span class="lineno"> 173</span>&#160; assert(status);</div>
<div class="line"><a name="l00174"></a><span class="lineno"> 174</span>&#160; cerr &lt;&lt; ThriftDebugString(file_metadata) &lt;&lt; endl;</div>
<div class="line"><a name="l00175"></a><span class="lineno"> 175</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot;Schema: &quot;</span> &lt;&lt; endl &lt;&lt; <a class="code" href="parquet-reader_8cc.html#ada76d38004c85c6b85ad83161f7b9545">GetSchema</a>(file_metadata) &lt;&lt; endl;</div>
<div class="line"><a name="l00176"></a><span class="lineno"> 176</span>&#160;</div>
<div class="line"><a name="l00177"></a><span class="lineno"> 177</span>&#160; <span class="keywordtype">int</span> pages_skipped = 0;</div>
<div class="line"><a name="l00178"></a><span class="lineno"> 178</span>&#160; <span class="keywordtype">int</span> pages_read = 0;</div>
<div class="line"><a name="l00179"></a><span class="lineno"> 179</span>&#160; <span class="keywordtype">int</span> num_rows = 0;</div>
<div class="line"><a name="l00180"></a><span class="lineno"> 180</span>&#160; <span class="keywordtype">int</span> total_page_header_size = 0;</div>
<div class="line"><a name="l00181"></a><span class="lineno"> 181</span>&#160; <span class="keywordtype">int</span> total_compressed_data_size = 0;</div>
<div class="line"><a name="l00182"></a><span class="lineno"> 182</span>&#160; <span class="keywordtype">int</span> total_uncompressed_data_size = 0;</div>
<div class="line"><a name="l00183"></a><span class="lineno"> 183</span>&#160; vector&lt;int&gt; column_sizes;</div>
<div class="line"><a name="l00184"></a><span class="lineno"> 184</span>&#160;</div>
<div class="line"><a name="l00185"></a><span class="lineno"> 185</span>&#160; <span class="comment">// Buffer to decompress data into. Reused across pages.</span></div>
<div class="line"><a name="l00186"></a><span class="lineno"> 186</span>&#160; vector&lt;char&gt; decompression_buffer;</div>
<div class="line"><a name="l00187"></a><span class="lineno"> 187</span>&#160;</div>
<div class="line"><a name="l00188"></a><span class="lineno"> 188</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; file_metadata.row_groups.size(); ++i) {</div>
<div class="line"><a name="l00189"></a><span class="lineno"> 189</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot;Reading row group &quot;</span> &lt;&lt; i &lt;&lt; endl;</div>
<div class="line"><a name="l00190"></a><span class="lineno"> 190</span>&#160; RowGroup&amp; rg = file_metadata.row_groups[i];</div>
<div class="line"><a name="l00191"></a><span class="lineno"> 191</span>&#160; column_sizes.resize(rg.columns.size());</div>
<div class="line"><a name="l00192"></a><span class="lineno"> 192</span>&#160;</div>
<div class="line"><a name="l00193"></a><span class="lineno"> 193</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> c = 0; c &lt; rg.columns.size(); ++c) {</div>
<div class="line"><a name="l00194"></a><span class="lineno"> 194</span>&#160; cerr &lt;&lt; <span class="stringliteral">&quot; Reading column &quot;</span> &lt;&lt; c &lt;&lt; endl;</div>
<div class="line"><a name="l00195"></a><span class="lineno"> 195</span>&#160; ColumnChunk&amp; col = rg.columns[c];</div>
<div class="line"><a name="l00196"></a><span class="lineno"> 196</span>&#160;</div>
<div class="line"><a name="l00197"></a><span class="lineno"> 197</span>&#160; <span class="keywordtype">int</span> first_page_offset = col.meta_data.data_page_offset;</div>
<div class="line"><a name="l00198"></a><span class="lineno"> 198</span>&#160; <span class="keywordflow">if</span> (col.meta_data.__isset.dictionary_page_offset) {</div>
<div class="line"><a name="l00199"></a><span class="lineno"> 199</span>&#160; first_page_offset = ::min(first_page_offset,</div>
<div class="line"><a name="l00200"></a><span class="lineno"> 200</span>&#160; (<span class="keywordtype">int</span>)col.meta_data.dictionary_page_offset);</div>
<div class="line"><a name="l00201"></a><span class="lineno"> 201</span>&#160; }</div>
<div class="line"><a name="l00202"></a><span class="lineno"> 202</span>&#160; uint8_t* data = buffer + first_page_offset;</div>
<div class="line"><a name="l00203"></a><span class="lineno"> 203</span>&#160; uint8_t* col_end = data + col.meta_data.total_compressed_size;</div>
<div class="line"><a name="l00204"></a><span class="lineno"> 204</span>&#160;</div>
<div class="line"><a name="l00205"></a><span class="lineno"> 205</span>&#160; <span class="comment">// Loop through the entire column chunk. This lets us walk all the pages.</span></div>
<div class="line"><a name="l00206"></a><span class="lineno"> 206</span>&#160; <span class="keywordflow">while</span> (data &lt; col_end) {</div>
<div class="line"><a name="l00207"></a><span class="lineno"> 207</span>&#160; uint32_t header_size = file_len - col.file_offset;</div>
<div class="line"><a name="l00208"></a><span class="lineno"> 208</span>&#160; PageHeader header;</div>
<div class="line"><a name="l00209"></a><span class="lineno"> 209</span>&#160; status = <a class="code" href="parquet-reader_8cc.html#ad53afba3f369cbf9749e3d4d3a9e841a">DeserializeThriftMsg</a>(data, &amp;header_size, <span class="keyword">true</span>, &amp;header);</div>
<div class="line"><a name="l00210"></a><span class="lineno"> 210</span>&#160; assert(status);</div>
<div class="line"><a name="l00211"></a><span class="lineno"> 211</span>&#160; <span class="keywordflow">if</span> (FLAGS_output_page_header) {</div>
<div class="line"><a name="l00212"></a><span class="lineno"> 212</span>&#160; cerr &lt;&lt; ThriftDebugString(header) &lt;&lt; endl;</div>
<div class="line"><a name="l00213"></a><span class="lineno"> 213</span>&#160; }</div>
<div class="line"><a name="l00214"></a><span class="lineno"> 214</span>&#160;</div>
<div class="line"><a name="l00215"></a><span class="lineno"> 215</span>&#160; data += header_size;</div>
<div class="line"><a name="l00216"></a><span class="lineno"> 216</span>&#160; total_page_header_size += header_size;</div>
<div class="line"><a name="l00217"></a><span class="lineno"> 217</span>&#160; column_sizes[c] += header.compressed_page_size;</div>
<div class="line"><a name="l00218"></a><span class="lineno"> 218</span>&#160; total_compressed_data_size += header.compressed_page_size;</div>
<div class="line"><a name="l00219"></a><span class="lineno"> 219</span>&#160; total_uncompressed_data_size += header.uncompressed_page_size;</div>
<div class="line"><a name="l00220"></a><span class="lineno"> 220</span>&#160; data += header.compressed_page_size;</div>
<div class="line"><a name="l00221"></a><span class="lineno"> 221</span>&#160; ++pages_read;</div>
<div class="line"><a name="l00222"></a><span class="lineno"> 222</span>&#160; }</div>
<div class="line"><a name="l00223"></a><span class="lineno"> 223</span>&#160; <span class="comment">// Check that we ended exactly where we should have</span></div>
<div class="line"><a name="l00224"></a><span class="lineno"> 224</span>&#160; assert(data == col_end);</div>
<div class="line"><a name="l00225"></a><span class="lineno"> 225</span>&#160; }</div>
<div class="line"><a name="l00226"></a><span class="lineno"> 226</span>&#160; }</div>
<div class="line"><a name="l00227"></a><span class="lineno"> 227</span>&#160; <span class="keywordtype">double</span> compression_ratio =</div>
<div class="line"><a name="l00228"></a><span class="lineno"> 228</span>&#160; (double)total_uncompressed_data_size / total_compressed_data_size;</div>
<div class="line"><a name="l00229"></a><span class="lineno"> 229</span>&#160; stringstream ss;</div>
<div class="line"><a name="l00230"></a><span class="lineno"> 230</span>&#160; ss &lt;&lt; <span class="stringliteral">&quot;\nSummary:\n&quot;</span></div>
<div class="line"><a name="l00231"></a><span class="lineno"> 231</span>&#160; &lt;&lt; <span class="stringliteral">&quot; Rows: &quot;</span> &lt;&lt; num_rows &lt;&lt; endl</div>
<div class="line"><a name="l00232"></a><span class="lineno"> 232</span>&#160; &lt;&lt; <span class="stringliteral">&quot; Read pages: &quot;</span> &lt;&lt; pages_read &lt;&lt; endl</div>
<div class="line"><a name="l00233"></a><span class="lineno"> 233</span>&#160; &lt;&lt; <span class="stringliteral">&quot; Skipped pages: &quot;</span> &lt;&lt; pages_skipped &lt;&lt; endl</div>
<div class="line"><a name="l00234"></a><span class="lineno"> 234</span>&#160; &lt;&lt; <span class="stringliteral">&quot; Metadata size: &quot;</span> &lt;&lt; metadata_len</div>
<div class="line"><a name="l00235"></a><span class="lineno"> 235</span>&#160; &lt;&lt; <span class="stringliteral">&quot;(&quot;</span> &lt;&lt; (metadata_len / (double)file_len) &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; endl</div>
<div class="line"><a name="l00236"></a><span class="lineno"> 236</span>&#160; &lt;&lt; <span class="stringliteral">&quot; Total page header size: &quot;</span> &lt;&lt; total_page_header_size</div>
<div class="line"><a name="l00237"></a><span class="lineno"> 237</span>&#160; &lt;&lt; <span class="stringliteral">&quot;(&quot;</span> &lt;&lt; (total_page_header_size / (double)file_len) &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; endl;</div>
<div class="line"><a name="l00238"></a><span class="lineno"> 238</span>&#160; ss &lt;&lt; <span class="stringliteral">&quot; Column compressed size: &quot;</span> &lt;&lt; total_compressed_data_size</div>
<div class="line"><a name="l00239"></a><span class="lineno"> 239</span>&#160; &lt;&lt; <span class="stringliteral">&quot;(&quot;</span> &lt;&lt; (total_compressed_data_size / (double)file_len) &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; endl;</div>
<div class="line"><a name="l00240"></a><span class="lineno"> 240</span>&#160; ss &lt;&lt; <span class="stringliteral">&quot; Column uncompressed size: &quot;</span> &lt;&lt; total_uncompressed_data_size</div>
<div class="line"><a name="l00241"></a><span class="lineno"> 241</span>&#160; &lt;&lt; <span class="stringliteral">&quot;(&quot;</span> &lt;&lt; compression_ratio &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; endl;</div>
<div class="line"><a name="l00242"></a><span class="lineno"> 242</span>&#160; <span class="keywordflow">for</span> (<span class="keywordtype">int</span> i = 0; i &lt; column_sizes.size(); ++i) {</div>
<div class="line"><a name="l00243"></a><span class="lineno"> 243</span>&#160; ss &lt;&lt; <span class="stringliteral">&quot; &quot;</span> &lt;&lt; <span class="stringliteral">&quot;Col &quot;</span> &lt;&lt; i &lt;&lt; <span class="stringliteral">&quot;: &quot;</span> &lt;&lt; column_sizes[i]</div>
<div class="line"><a name="l00244"></a><span class="lineno"> 244</span>&#160; &lt;&lt; <span class="stringliteral">&quot;(&quot;</span> &lt;&lt; (column_sizes[i] / (double)file_len) &lt;&lt; <span class="stringliteral">&quot;)&quot;</span> &lt;&lt; endl;</div>
<div class="line"><a name="l00245"></a><span class="lineno"> 245</span>&#160; }</div>
<div class="line"><a name="l00246"></a><span class="lineno"> 246</span>&#160; cerr &lt;&lt; ss.str() &lt;&lt; endl;</div>
<div class="line"><a name="l00247"></a><span class="lineno"> 247</span>&#160;</div>
<div class="line"><a name="l00248"></a><span class="lineno"> 248</span>&#160; <span class="keywordflow">return</span> 0;</div>
<div class="line"><a name="l00249"></a><span class="lineno"> 249</span>&#160;}</div>
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<div class="ttc" id="parquet-reader_8cc_html_a35f3b2e28fff4bc3e1ae6733a834eb45"><div class="ttname"><a href="parquet-reader_8cc.html#a35f3b2e28fff4bc3e1ae6733a834eb45">CreateDeserializeProtocol</a></div><div class="ttdeci">shared_ptr&lt; TProtocol &gt; CreateDeserializeProtocol(shared_ptr&lt; TMemoryBuffer &gt; mem, bool compact)</div><div class="ttdef"><b>Definition:</b> <a href="parquet-reader_8cc_source.html#l00051">parquet-reader.cc:51</a></div></div>
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<div class="ttc" id="parquet-reader_8cc_html_aaacbca5eda3de7c4b1afd6e0d11470ec"><div class="ttname"><a href="parquet-reader_8cc.html#aaacbca5eda3de7c4b1afd6e0d11470ec">AppendSchema</a></div><div class="ttdeci">void AppendSchema(const vector&lt; SchemaElement &gt; &amp;schema, int level, int *idx, stringstream *ss)</div><div class="ttdef"><b>Definition:</b> <a href="parquet-reader_8cc_source.html#l00101">parquet-reader.cc:101</a></div></div>
<div class="ttc" id="rle-encoding_8h_html"><div class="ttname"><a href="rle-encoding_8h.html">rle-encoding.h</a></div></div>
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<div class="ttc" id="parquet-reader_8cc_html_addbff50e6868726f2aac6d6b5468e1ed"><div class="ttname"><a href="parquet-reader_8cc.html#addbff50e6868726f2aac6d6b5468e1ed">TypeMapping</a></div><div class="ttdeci">string TypeMapping(Type::type t)</div><div class="ttdef"><b>Definition:</b> <a href="parquet-reader_8cc_source.html#l00082">parquet-reader.cc:82</a></div></div>
<div class="ttc" id="names_8h_html"><div class="ttname"><a href="names_8h.html">names.h</a></div></div>
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