b41sh opened a new pull request #719:
URL: https://github.com/apache/arrow-datafusion/pull/719
# Which issue does this PR close?
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Closes #640.
# Rationale for this change
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Speeding up max and min queries that can utilize the availability of the
table column statistics.
On the TPC-H `lineitem` table we can see a 600x speedup:
```
> CREATE EXTERNAL TABLE X STORED AS PARQUET LOCATION
'./benchmarks/parquet/lineitem/';
> select max(l_orderkey) from X;
+-----------------+
| MAX(l_orderkey) |
+-----------------+
| 6000000 |
+-----------------+
1 row in set. Query took 0.004 seconds.
> select min(l_quantity) from X;
+-----------------+
| MIN(l_quantity) |
+-----------------+
| 1 |
+-----------------+
1 row in set. Query took 0.003 seconds.
```
Master:
```
> CREATE EXTERNAL TABLE X STORED AS PARQUET LOCATION
'./benchmarks/parquet/lineitem/';
> select max(l_orderkey) from X;
+-----------------+
| MAX(l_orderkey) |
+-----------------+
| 6000000 |
+-----------------+
1 row in set. Query took 2.589 seconds.
> select min(l_quantity) from X;
+-----------------+
| MIN(l_quantity) |
+-----------------+
| 1 |
+-----------------+
1 row in set. Query took 2.146 seconds.
```
# What changes are included in this PR?
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# Are there any user-facing changes?
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