parquet-tools: add page (#4588)

pages/common/parquet-tools.md

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+# parquet-tools
+
+> A tool to show, inspect and manipulate Parquet file.
+> More information: <https://github.com/apache/parquet-mr/tree/master/parquet-tools>.
+
+- Display the content of a Parquet file:
+
+`parquet-tools cat {{path/to/parquet}}`
+
+- Display the first few lines of a Parquet file:
+
+`parquet-tools head {{path/to/parquet}}`
+
+- Print the schema of a Parquet file:
+
+`parquet-tools schema {{path/to/parquet}}`
+
+- Print the metadata of a Parquet file:
+
+`parquet-tools meta {{path/to/parquet}}`
+
+- Print the content and metadata of a Parquet file:
+
+`parquet-tools dump {{path/to/parquet}}`
+
+- Concatenate several Parquet files into the target one:
+
+`parquet-tools merge {{path/to/parquet1}} {{path/to/parquet2}} {{path/to/target_parquet}}`
+
+- Print the count of rows in a Parquet file:
+
+`parquet-tools rowcount {{path/to/parquet}}`
+
+- Print the column and offset indexes of a Parquet file:
+
+`parquet-tools column-index {{path/to/parquet}}`