Liang-Chi Hsieh created SPARK-25363:
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Summary: Schema pruning doesn't work if nested column is used in
where clause
Key: SPARK-25363
URL: https://issues.apache.org/jira/browse/SPARK-25363
Project: Spark
Issue Type: Bug
Components: SQL
Affects Versions: 2.4.0
Reporter: Liang-Chi Hsieh
Schema pruning doesn't work if nested column is used in where clause.
For example,
{code}
sql("select name.first from contacts where name.first = 'David'")
== Physical Plan ==
*(1) Project [name#19.first AS first#40]
+- *(1) Filter (isnotnull(name#19) && (name#19.first = David))
+- *(1) FileScan parquet [name#19] Batched: false, Format: Parquet,
PartitionFilters: [],
PushedFilters: [IsNotNull(name)], ReadSchema:
struct<name:struct<first:string,middle:string,last:string>>
{code}
In above query plan, the scan node reads the entire schema of `name` column.
This issue is reported by:
https://github.com/apache/spark/pull/21320#issuecomment-419290197
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