add sample.sql

Author: chernser

performance/sample_dataset.sql

@@ -0,0 +1,40 @@
+CREATE TABLE big_columns_example
+(
+    -- Float64 columns
+    float_col_1 Float64,
+    float_col_2 Float64,
+    float_col_3 Float64,
+    float_col_4 Float64,
+    float_col_5 Float64,
+    float_col_6 Float64,
+    float_col_7 Float64,
+    float_col_8 Float64,
+    float_col_9 Float64,
+    float_col_10 Float64,
+
+    -- String columns
+    str_col_1 String,
+    str_col_2 String,
+    str_col_3 String,
+    str_col_4 String,
+    str_col_5 String,
+    str_col_6 String,
+    str_col_7 String,
+    str_col_8 String,
+    str_col_9 String,
+    str_col_10 String,
+
+    -- Int64 columns
+    int_col_1 Int64,
+    int_col_2 Int64,
+    int_col_3 Int64,
+    int_col_4 Int64,
+    int_col_5 Int64,
+    int_col_6 Int64,
+    int_col_7 Int64,
+    int_col_8 Int64,
+    int_col_9 Int64,
+    int_col_10 Int64
+)
+ENGINE = MergeTree
+ORDER BY tuple();