ovr opened a new pull request, #2454:
URL: https://github.com/apache/arrow-datafusion/pull/2454
# Which issue does this PR close?
I didn't create a new issue for it.
# Rationale for this change
Right now, DF supports GetIndexed access with MapAccessExpr which is not
correct for compatibility with PostgreSQL.
For example:
```sql
// DF supports it, but It doesn't work with PostgreSQL
SELECT (information_schema._pg_expandarray(ARRAY [1,2,3,4]))["x"];
// This PR introduce this, which is supported with PostgreSQL
SELECT (information_schema._pg_expandarray(ARRAY [1,2,3,4])).x;
```
# What changes are included in this PR?
From subject.
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