Add test

tests/queries/0_stateless/02968_file_log_multiple_read.reference

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tests/queries/0_stateless/02968_file_log_multiple_read.sh

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+#!/usr/bin/env bash
+
+CUR_DIR=$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)
+# shellcheck source=../shell_config.sh
+. "$CUR_DIR"/../shell_config.sh
+
+# Data preparation.
+# Now we can get the user_files_path by use the table file function for trick. also we can get it by query as:
+#  "insert into function file('exist.txt', 'CSV', 'val1 char') values ('aaaa'); select _path from file('exist.txt', 'CSV', 'val1 char')"
+user_files_path=$($CLICKHOUSE_CLIENT_BINARY --query "select _path,_file from file('nonexist.txt', 'CSV', 'val1 char')" 2>&1 | grep Exception | awk '{gsub("/nonexist.txt","",$9); print $9}')
+
+logs_dir=${user_files_path}/${CLICKHOUSE_TEST_UNIQUE_NAME}
+
+rm -rf ${logs_dir}
+
+mkdir -p ${logs_dir}/
+
+for i in {1..10}
+do
+	echo $i >> ${logs_dir}/a.txt
+done
+
+${CLICKHOUSE_CLIENT} -n --query="
+DROP TABLE IF EXISTS file_log;
+DROP TABLE IF EXISTS table_to_store_data;
+DROP TABLE IF EXISTS file_log_mv;
+
+CREATE TABLE file_log (
+    id Int64
+) ENGINE = FileLog('${logs_dir}/', 'CSV');
+
+CREATE TABLE table_to_store_data (
+    id Int64
+) ENGINE = MergeTree
+ORDER BY id;
+
+CREATE MATERIALIZED VIEW file_log_mv TO table_to_store_data AS
+    SELECT id
+    FROM file_log
+    WHERE id NOT IN (
+        SELECT id
+        FROM table_to_store_data
+        WHERE id IN (
+            SELECT id
+            FROM file_log
+        )
+    );
+"
+
+function count()
+{
+	COUNT=$(${CLICKHOUSE_CLIENT} --query "select count() from table_to_store_data;")
+	echo $COUNT
+}
+
+for i in {1..10}
+do
+	[[ $(count) > 0 ]] && break
+	sleep 1
+done
+
+${CLICKHOUSE_CLIENT} --query "SELECT * FROM table_to_store_data ORDER BY id;"
+
+for i in {1..20}
+do
+	echo $i >> ${logs_dir}/a.txt
+done
+
+for i in {1..10}
+do
+	[[ $(count) > 10 ]] && break
+	sleep 1
+done
+
+${CLICKHOUSE_CLIENT} --query "SELECT * FROM table_to_store_data ORDER BY id;"
+
+${CLICKHOUSE_CLIENT} -n --query="
+DROP TABLE file_log;
+DROP TABLE table_to_store_data;
+DROP TABLE file_log_mv;
+"
+
+rm -rf ${logs_dir}