wangyum commented on PR #42376:
URL: https://github.com/apache/spark/pull/42376#issuecomment-1671438383
@monkeyboy123 Have you enabled
`spark.sql.optimizer.collapseProjectAlwaysInline`?
```scala
Seq("""{"a":1, "b":0.8}""").toDF("s").write.saveAsTable("t")
val df = sql(
"""
|SELECT j.*
|FROM (SELECT from_json(regexp_replace(s, 'a', 'new_a'), 'new_a INT, b
DOUBLE') AS j
| FROM t) tmp
|""".stripMargin)
df.explain(true)
```
`set spark.sql.optimizer.collapseProjectAlwaysInline=false`:
```
== Optimized Logical Plan ==
Project [j#17.new_a AS new_a#20, j#17.b AS b#21]
+- Project [from_json(StructField(new_a,IntegerType,true),
StructField(b,DoubleType,true), regexp_replace(s#18, a, new_a, 1),
Some(America/Los_Angeles)) AS j#17]
+- Relation spark_catalog.default.t[s#18] parquet
== Physical Plan ==
*(2) Project [j#17.new_a AS new_a#20, j#17.b AS b#21]
+- Project [from_json(StructField(new_a,IntegerType,true),
StructField(b,DoubleType,true), regexp_replace(s#18, a, new_a, 1),
Some(America/Los_Angeles)) AS j#17]
+- *(1) ColumnarToRow
+- FileScan parquet spark_catalog.default.t[s#18] Batched: true,
DataFilters: [], Format: Parquet, Location: InMemoryFileIndex(1
paths)[file:/Users/yumwang/spark/spark-warehouse/org.apache.spark...,
PartitionFilters: [], PushedFilters: [], ReadSchema: struct<s:string>
```
`set spark.sql.optimizer.collapseProjectAlwaysInline=true`:
```
== Optimized Logical Plan ==
Project [from_json(StructField(new_a,IntegerType,true), regexp_replace(s#18,
a, new_a, 1), Some(America/Los_Angeles)).new_a AS new_a#20,
from_json(StructField(b,DoubleType,true), regexp_replace(s#18, a, new_a, 1),
Some(America/Los_Angeles)).b AS b#21]
+- Relation spark_catalog.default.t[s#18] parquet
== Physical Plan ==
Project [from_json(StructField(new_a,IntegerType,true), regexp_replace(s#18,
a, new_a, 1), Some(America/Los_Angeles)).new_a AS new_a#20,
from_json(StructField(b,DoubleType,true), regexp_replace(s#18, a, new_a, 1),
Some(America/Los_Angeles)).b AS b#21]
+- *(1) ColumnarToRow
+- FileScan parquet spark_catalog.default.t[s#18] Batched: true,
DataFilters: [], Format: Parquet, Location: InMemoryFileIndex(1
paths)[file:/Users/yumwang/spark/spark-warehouse/org.apache.spark...,
PartitionFilters: [], PushedFilters: [], ReadSchema: struct<s:string>
```
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