huaxingao commented on code in PR #10659:
URL: https://github.com/apache/iceberg/pull/10659#discussion_r1680162221
##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
##########
@@ -175,7 +181,25 @@ public Statistics estimateStatistics() {
protected Statistics estimateStatistics(Snapshot snapshot) {
// its a fresh table, no data
if (snapshot == null) {
- return new Stats(0L, 0L);
+ return new Stats(0L, 0L, Maps.newHashMap());
+ }
+
+ Map<NamedReference, ColumnStatistics> map = Maps.newHashMap();
+
+ if (readConf.enableColumnStats()) {
+ List<StatisticsFile> files = table.statisticsFiles();
+ if (!files.isEmpty()) {
+ List<BlobMetadata> metadataList = (files.get(0)).blobMetadata();
+
+ for (BlobMetadata blobMetadata : metadataList) {
+ long ndv = Long.parseLong(blobMetadata.properties().get("ndv"));
Review Comment:
I have added the code to check null and empty value. It's probably too
strict to throw Exception if the value is null or empty String. I log a DEBUG
message instead.
Is there an agreed type for `org.apache.iceberg.BlobMetadata#type`? If yes,
I will add a check.
##########
spark/v3.5/spark/src/test/java/org/apache/iceberg/spark/source/TestSparkScan.java:
##########
@@ -97,6 +117,36 @@ public static Object[][] parameters() {
};
}
+ @BeforeAll
Review Comment:
Removed and added `withSQLConf`
##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/SparkSQLProperties.java:
##########
@@ -90,4 +90,8 @@ private SparkSQLProperties() {}
public static final String EXECUTOR_CACHE_LOCALITY_ENABLED =
"spark.sql.iceberg.executor-cache.locality.enabled";
public static final boolean EXECUTOR_CACHE_LOCALITY_ENABLED_DEFAULT = false;
+
+ // Controls whether column statistics are enabled when estimating statistics
Review Comment:
Changed to `// Controls whether to calculate column statistics and report
them to Spark`
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