MasseGuillaume opened a new pull request, #3139:
URL: https://github.com/apache/calcite/pull/3139
for example Apache Spark uses a built-in function do define maps:
```
> SELECT map(1.0, '2', 3.0, '4');
{1.0:"2",3.0:"4"}
```
https://spark.apache.org/docs/latest/api/sql/index.html#map
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