RussellSpitzer commented on code in PR #10659:
URL: https://github.com/apache/iceberg/pull/10659#discussion_r1681647818
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spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
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@@ -175,7 +184,37 @@ 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, Collections.emptyMap());
+ }
+
+ boolean cboEnabled =
+ Boolean.parseBoolean(spark.conf().get(SQLConf.CBO_ENABLED().key(),
"false"));
+ Map<NamedReference, ColumnStatistics> colStatsMap = null;
+ if (readConf.enableColumnStats() && cboEnabled) {
+ colStatsMap = Maps.newHashMap();
+ List<StatisticsFile> files = table.statisticsFiles();
+ if (!files.isEmpty()) {
+ List<BlobMetadata> metadataList = (files.get(0)).blobMetadata();
+
+ for (BlobMetadata blobMetadata : metadataList) {
+ int id = blobMetadata.fields().get(0);
+ String colName = table.schema().findColumnName(id);
+ NamedReference ref = FieldReference.column(colName);
+
+ long ndv = 0;
+ String ndvStr = blobMetadata.properties().get("ndv");
+ if (ndvStr != null && !ndvStr.isEmpty()) {
+ ndv = Long.parseLong(blobMetadata.properties().get("ndv"));
+ } else {
+ LOG.debug("ndv is not set in BlobMetadata for column {}", colName);
+ }
+
+ // TODO: Fill min, max and null from the manifest file
+ ColumnStatistics colStats = new SparkColumnStatistics(ndv, null,
null, 0L, 0L, 0L, null);
Review Comment:
Yeah I didn't see notes in the Spark docs about what 0 would mean in this
context.
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