psvri opened a new issue, #15069:
URL: https://github.com/apache/iceberg/issues/15069
### Apache Iceberg version
1.10.1 (latest release)
### Query engine
Spark
### Please describe the bug 🐞
Hello,
I observed that icebergs aggregate pushdown is giving wrong result when a
column contains NaN. The below pyspark snippet shows the same.
```
spark = SparkSession.builder \
.appName("Example") \
.config("spark.sql.extensions",
"org.apache.iceberg.spark.extensions.IcebergSparkSessionExtensions") \
.config("spark.sql.catalog.spark_catalog",
"org.apache.iceberg.spark.SparkCatalog") \
.config("spark.sql.catalog.spark_catalog.type", "hadoop") \
.config("spark.sql.catalog.spark_catalog.warehouse",
"/tmp/iceberg_warehouse") \
.config("spark.jars.packages",
"org.apache.iceberg:iceberg-spark-runtime-3.5_2.12:1.10.1") \
.getOrCreate()
spark.sql("CREATE TABLE random_table (id INT, value FLOAT) USING iceberg")
```
With pushdown
```
spark.conf.set("spark.sql.iceberg.aggregate-push-down.enabled", "true")
spark.sql("select max(value) from random_table").explain()
spark.sql("select max(value) from random_table").show()
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- HashAggregate(keys=[], functions=[max(agg_func_0#504)])
+- Exchange SinglePartition, ENSURE_REQUIREMENTS, [plan_id=557]
+- HashAggregate(keys=[], functions=[partial_max(agg_func_0#504)])
+- Project [max(value)#505 AS agg_func_0#504]
+- LocalTableScan [max(value)#505]
+----------+
|max(value)|
+----------+
|0.66714805|
+----------+
```
Without pushdown
```
spark.conf.set("spark.sql.iceberg.aggregate-push-down.enabled", "false")
spark.sql("select max(value) from random_table").explain()
spark.sql("select max(value) from random_table").show()
== Physical Plan ==
AdaptiveSparkPlan isFinalPlan=false
+- HashAggregate(keys=[], functions=[max(value#531)])
+- Exchange SinglePartition, ENSURE_REQUIREMENTS, [plan_id=601]
+- HashAggregate(keys=[], functions=[partial_max(value#531)])
+- BatchScan spark_catalog.default.random_table[value#531]
spark_catalog.default.random_table (branch=null) [filters=, groupedBy=]
RuntimeFilters: []
+----------+
|max(value)|
+----------+
| NaN|
+----------+
```
### Willingness to contribute
- [x] I can contribute a fix for this bug independently
- [ ] I would be willing to contribute a fix for this bug with guidance from
the Iceberg community
- [ ] I cannot contribute a fix for this bug at this time
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