itholic opened a new pull request, #49982:
URL: https://github.com/apache/spark/pull/49982
### What changes were proposed in this pull request?
This PR proposes to improve Column performance when
DQC(DataFrameQueryContext) is disabled by delaying to call `getActiveSession`
which is pretty expensive.
### Why are the changes needed?
To improve the performance of Column operations.
### Does this PR introduce _any_ user-facing change?
No, API changes but only improves the performance
### How was this patch tested?
Manually tested, and also the existing CI should pass.
```python
>>> spark.conf.get("spark.python.sql.dataFrameDebugging.enabled")
'false'
```
**Before fix**
```python
>>> import time
>>> import pyspark.sql.functions as F
>>>
>>> c = F.col("name")
>>> start = time.time()
>>> for i in range(10000):
... _ = c.alias("a")
...
>>> print(time.time() - start)
2.061354875564575
```
**After fix**
```python
>>> import time
>>> import pyspark.sql.functions as F
>>>
>>> c = F.col("name")
>>> start = time.time()
>>> for i in range(10000):
... _ = c.alias("a")
...
>>> print(time.time() - start)
0.8050589561462402
```
And there is no difference when the flag is on:
```python
>>> spark.conf.get("spark.python.sql.dataFrameDebugging.enabled")
'true'
```
**Before fix**
```python
>>> import time
>>> import pyspark.sql.functions as F
>>>
>>> c = F.col("name")
>>> start = time.time()
>>> for i in range(10000):
... _ = c.alias("a")
...
>>> print(time.time() - start)
3.755108118057251
```
**After fix**
```python
>>> import time
>>> import pyspark.sql.functions as F
>>>
>>> c = F.col("name")
>>> start = time.time()
>>> for i in range(10000):
... _ = c.alias("a")
...
>>> print(time.time() - start)
3.6577670574188232
```
### Was this patch authored or co-authored using generative AI tooling?
No.
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