RussellSpitzer commented on code in PR #10659: URL: https://github.com/apache/iceberg/pull/10659#discussion_r1693625673
########## spark/v3.5/spark/src/main/java/org/apache/iceberg/spark/source/SparkScan.java: ########## @@ -175,7 +185,46 @@ 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.reportColumnStats() && 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 = null; + if (blobMetadata + .type() + .equals(org.apache.iceberg.puffin.StandardBlobTypes.APACHE_DATASKETCHES_THETA_V1)) { + String ndvStr = blobMetadata.properties().get(NDV_KEY); + if (ndvStr != null && !ndvStr.isEmpty()) { + ndv = Long.parseLong(ndvStr); + } else { + LOG.debug("ndv is not set in BlobMetadata for column {}", colName); + } + } else { + LOG.debug("DataSketch blob is not available for column {}", colName); + } + + // TODO: Fill min, max and null from the manifest file Review Comment: Can we remove the TODO and make an Issue? -- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For queries about this service, please contact Infrastructure at: us...@infra.apache.org --------------------------------------------------------------------- To unsubscribe, e-mail: issues-unsubscr...@iceberg.apache.org For additional commands, e-mail: issues-h...@iceberg.apache.org