Xiao Li created SPARK-16355:
-------------------------------
Summary: Incorrect Statistics when Queries Containing
LIMIT/TABLESAMPLE 0
Key: SPARK-16355
URL: https://issues.apache.org/jira/browse/SPARK-16355
Project: Spark
Issue Type: Bug
Reporter: Xiao Li
When a query containing LIMIT/TABLESAMPLE 0, the statistics could be zero.
Results are correct but it could cause a huge performance regression. For
example,
{noformat}
Seq(("one", 1), ("two", 2), ("three", 3), ("four", 4)).toDF("k", "v")
.createOrReplaceTempView("test")
val df1 = spark.table("test")
val df2 = spark.table("test").limit(0)
val df = df1.join(df2, Seq("k"), "left")
{noformat}
The statistics of both {{df}} and {{df2}} are zero.
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