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# Expression Compatibility (Spark 3.4)

Compatibility notes for Comet running on Apache Spark 3.4. Expressions that are not 100%
Spark-compatible fall back to Spark by default, except those with a JVM codegen-dispatch
path, which stay in Comet's native pipeline and match Spark exactly. Set
`spark.comet.expression.EXPRNAME.allowIncompatible=true`, where `EXPRNAME` is the Spark
expression class name, to run Comet's faster native implementation despite its differences
from Spark. See the [Comet Supported Expressions Guide](../../../expressions.md)
for more information on this configuration setting.

```{toctree}
:maxdepth: 1

aggregate
array
datetime
map
math
misc
string
struct
url
cast
```
