karuppayya commented on code in PR #10659:
URL: https://github.com/apache/iceberg/pull/10659#discussion_r1681586861
##########
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 to calculate column statistics and report them to Spark
Review Comment:
nit: should we say that this flag controls whetehre stats should be reported
to Spark, since the computation is done off band?
##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
##########
@@ -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);
Review Comment:
Should we check if there is more than one field here(for example, ndv stats
is collected for say field1 and field2) and not propagate the stats if so?
##########
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();
Review Comment:
created https://github.com/apache/iceberg/issues/10693
##########
spark/v3.5/spark/src/test/java/org/apache/iceberg/spark/source/TestSparkScan.java:
##########
@@ -734,6 +795,19 @@ private Expression[] expressions(Expression...
expressions) {
return expressions;
}
+ private void checkStatistics(SparkScan scan, long expectedRowCount, boolean
expectedColumnStats) {
Review Comment:
when `expectedColumnStats` is false, can we assert the absence of stats
##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
##########
@@ -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:
When ndv is not set, we are sending in 0. Is that intended?
##########
spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java:
##########
@@ -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");
Review Comment:
nit: "ndv" could be static final?
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