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<div class="codehilite"><pre><span></span><code><span class="c1">-- map_concat</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">map_concat</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;b&#39;</span><span class="p">),</span><span class="w"> </span><span class="k">map</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;c&#39;</span><span class="p">));</span><span class="w"></span>
<span class="o">+</span><span class="c1">--------------------------------------+</span>
<span class="o">|</span><span class="n">map_concat</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">),</span><span class="w"> </span><span class="k">map</span><span class="p">(</span><span class="mi">3</span><span class="p">,</span><span class="w"> </span><span class="k">c</span><span class="p">))</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">--------------------------------------+</span>
<span class="o">|</span><span class="w"> </span><span class="err">{</span><span class="mi">1</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">b</span><span class="p">,</span><span class="w"> </span><span class="p">...</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">--------------------------------------+</span>
<span class="c1">-- map_entries</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">map_entries</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;b&#39;</span><span class="p">));</span><span class="w"></span>
<span class="o">+</span><span class="c1">----------------------------+</span>
<span class="o">|</span><span class="n">map_entries</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">))</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">----------------------------+</span>
<span class="o">|</span><span class="w"> </span><span class="p">[</span><span class="err">{</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">a</span><span class="err">}</span><span class="p">,</span><span class="w"> </span><span class="err">{</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="err">}</span><span class="p">]</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">----------------------------+</span>
<span class="c1">-- map_from_entries</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">map_from_entries</span><span class="p">(</span><span class="nb">array</span><span class="p">(</span><span class="n">struct</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">),</span><span class="w"> </span><span class="n">struct</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;b&#39;</span><span class="p">)));</span><span class="w"></span>
<span class="o">+</span><span class="c1">---------------------------------------------------+</span>
<span class="o">|</span><span class="n">map_from_entries</span><span class="p">(</span><span class="nb">array</span><span class="p">(</span><span class="n">struct</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">a</span><span class="p">),</span><span class="w"> </span><span class="n">struct</span><span class="p">(</span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">)))</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">---------------------------------------------------+</span>
<span class="o">|</span><span class="w"> </span><span class="err">{</span><span class="mi">1</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="w"> </span><span class="o">-&gt;</span><span class="w"> </span><span class="n">b</span><span class="err">}</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">---------------------------------------------------+</span>
<span class="c1">-- map_keys</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">map_keys</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;b&#39;</span><span class="p">));</span><span class="w"></span>
<span class="o">+</span><span class="c1">-------------------------+</span>
<span class="o">|</span><span class="n">map_keys</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">))</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">-------------------------+</span>
<span class="o">|</span><span class="w"> </span><span class="p">[</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">]</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">-------------------------+</span>
<span class="c1">-- map_values</span>
<span class="k">SELECT</span><span class="w"> </span><span class="n">map_values</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;a&#39;</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="s1">&#39;b&#39;</span><span class="p">));</span><span class="w"></span>
<span class="o">+</span><span class="c1">---------------------------+</span>
<span class="o">|</span><span class="n">map_values</span><span class="p">(</span><span class="k">map</span><span class="p">(</span><span class="mi">1</span><span class="p">,</span><span class="w"> </span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="mi">2</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">))</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">---------------------------+</span>
<span class="o">|</span><span class="w"> </span><span class="p">[</span><span class="n">a</span><span class="p">,</span><span class="w"> </span><span class="n">b</span><span class="p">]</span><span class="o">|</span><span class="w"></span>
<span class="o">+</span><span class="c1">---------------------------+</span>
</code></pre></div>