add data migration via CSV files

Author: sunsingerus

run_airline_ontime_data_mysql_to_ch_migration.sh

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+#!/bin/bash
+# migrate data from MySQL to ClickHouse
+
+# put csv files in this dir
+CSV_FILES_DIR="/var/lib/mysql-files"
+
+# dump CSV files into CSV_FILES_DIR
+sudo mysqldump \
+    -u root \
+    --tz-utc \
+    --quick \
+    --fields-terminated-by=, \
+    --fields-optionally-enclosed-by=\" \
+    --fields-escaped-by=\\ \
+    --tab="$CSV_FILES_DIR"/ \
+    airline ontime
+
+# replay CSV files from CSV_FILES_DIR
+sudo cat "$CSV_FILES_DIR"/ontime.txt | clickhouse-client --query="INSERT INTO airline.ontime FORMAT CSV"