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| <h1 class="title topictitle1" id="ariaid-title1">EXPAND_COMPLEX_TYPES Query Option</h1> |
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| <div class="body conbody"> |
| <p class="p"> |
| Older versions of |
| Impala did not support complex types in the select list, and therefore a <code class="ph codeph">SELECT |
| *</code> statement only expanded to primitive types even when the table contained complex-typed |
| columns. Support for complex types in the select list has since been added, but for backward |
| compatibility the behaviour that <span class="q">"*"</span> expressions skip complex types has been kept as the |
| default. If the EXPAND_COMPLEX_TYPES query option is set to true, <span class="q">"*"</span> expressions will |
| include complex types as well. |
| </p> |
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| <p class="p"> |
| Note: even if EXPAND_COMPLEX_TYPES is false, complex-typed columns that are listed explicitly in |
| the select list (i.e. not as a <span class="q">"*"</span> expression) will be included in the result. |
| </p> |
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| <p class="p"><strong class="ph b">Type:</strong>BOOLEAN</p> |
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| <p class="p"><strong class="ph b">Default:</strong>FALSE</p> |
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| <p class="p"><strong class="ph b">Added in:</strong>Impala 4.2</p> |
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| <p class="p"> |
| <strong class="ph b">Related information:</strong> |
| </p> |
| |
| <p class="p"> |
| <a class="xref" href="impala_complex_types.html">Complex Types (Impala 2.3 or higher only)</a>, |
| </p> |
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| </div> |
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| <div class="related-links"> |
| <div class="familylinks"> |
| <div class="parentlink"><strong>Parent topic:</strong> <a class="link" href="../topics/impala_query_options.html">Query Options for the SET Statement</a></div> |
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