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          <span class="sr-only">Apache Calcite</span>
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      <p class="first">The foundation for your next high-performance database.</p>
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      <h2>Standard SQL</h2>
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      <a href="/docs/reference.html">SQL &rarr;</a>
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      <h2>Query optimization</h2>
      <p>Represent your query in relational algebra, transform using
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      <h2>Any data, anywhere</h2>
      <p>Connect to third-party data sources, browse metadata, and optimize by pushing the computation to the data.</p>
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      <h2>Support Apache</h2>
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