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[spark] Cover the zero a truncation reports surviving a later ANALYZE#9350

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[spark] Cover the zero a truncation reports surviving a later ANALYZE #9350

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27 changes: 27 additions & 0 deletions ...rk-ut/src/test/scala/org/apache/paimon/spark/sql/CatalogManagedPartitionAnalyzeTest.scala
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Expand Up@@ -42,6 +42,33 @@ import scala.collection.JavaConverters._
*/
class CatalogManagedPartitionAnalyzeTest extends PaimonSparkTestWithRestCatalogBase {

test("ANALYZE after a TRUNCATE keeps the exact zero the truncation reported") {
val tableName = "analyze_after_truncate"
withTable(tableName) {
createTable(tableName)
writeCsvPartition(tableName, "20260101", "00", 1)
repair(tableName)
sql(s"ANALYZE TABLE ${qualified(tableName)} COMPUTE STATISTICS NOSCAN").collect()
assert(statisticsOf(tableName, "20260101", "00").fileCount() == 1L)

sql(s"TRUNCATE TABLE ${qualified(tableName)} PARTITION (dt = '20260101', hour = '00')")
val truncated = statisticsOf(tableName, "20260101", "00")
assert(truncated.fileCount() == 0L, truncated.toString)
assert(truncated.recordCount() == 0L, truncated.toString)

// Measuring an empty partition must not turn "nothing is here" back into "nobody measured".
sql(s"ANALYZE TABLE ${qualified(tableName)} COMPUTE STATISTICS NOSCAN").collect()
val listed = statisticsOf(tableName, "20260101", "00")
assert(listed.fileCount() == 0L, listed.toString)
assert(listed.recordCount() == 0L, listed.toString)

sql(s"ANALYZE TABLE ${qualified(tableName)} COMPUTE STATISTICS").collect()
val scanned = statisticsOf(tableName, "20260101", "00")
assert(scanned.fileCount() == 0L, scanned.toString)
assert(scanned.recordCount() == 0L, scanned.toString)
}
}

test("ANALYZE with a full partition spec measures only that partition") {
val tableName = "analyze_full_spec"
withTable(tableName) {
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