[Backport 0.4] Disable unsupported PPL function expressions (#478)

[ykmr1224]

Backport 98bd79a from #478
(Automatic backport failed)

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[opensearch-trigger-bot]

The backport to 0.5 failed:

The process '/usr/bin/git' failed with exit code 128

To backport manually, run these commands in your terminal:

# Navigate to the root of your repository
cd $(git rev-parse --show-toplevel)
# Fetch latest updates from GitHub
git fetch
# Create a new working tree
git worktree add ../.worktrees/opensearch-spark/backport-0.5 0.5
# Navigate to the new working tree
pushd ../.worktrees/opensearch-spark/backport-0.5
# Create a new branch
git switch --create backport/backport-498-to-0.5
# Cherry-pick the merged commit of this pull request and resolve the conflicts
git cherry-pick -x --mainline 1 2965e434795d1278c99e226ead49f0427611f0fa
# Push it to GitHub
git push --set-upstream origin backport/backport-498-to-0.5
# Go back to the original working tree
popd
# Delete the working tree
git worktree remove ../.worktrees/opensearch-spark/backport-0.5

Then, create a pull request where the base branch is 0.5 and the compare/head branch is backport/backport-498-to-0.5.