https://cdelmonte.dev/tags/photon/ Recent content in Photon on cdelmonte.dev Hugo -- 0.147.7 en-us Tue, 26 May 2026 00:00:00 +0000 https://cdelmonte.dev/essays/where-spark-changes-shape/ Tue, 26 May 2026 00:00:00 +0000 https://cdelmonte.dev/essays/where-spark-changes-shape/ Run df.explain on a Parquet scan and you find ColumnarToRow, an operator whose only job is to change the data’s shape. It is the seam where two architectural eras meet, and a record of how portability in analytical systems has relocated from the JVM runtime to the data format and the query plan.