Merge branch 'master' of percona.github.com:Percona-Lab/random_data_load

Author: percona-csalguero

README.md

@@ -45,7 +45,7 @@ This is an early stage project.
 The program can detect if a field accepts NULLs and if it does, it will generate NULLs ramdomly (~ 10 % of the values).
 
 ## Usage
-`random-data-generator <database> <table> <number of rows> [options...]`
+`mysql_random_data_load <database> <table> <number of rows> [options...]`
 
 ## Options
 |Option|Description|
@@ -66,7 +66,7 @@ If a field has Foreign Keys constraints, `random-data-load` will get up to `--ma
 The number of samples to get follows this rules:  
 **1.** Get the aproximate number of rows in the referenced table using the `rows` field in:  
 ```
-EXPLAIN COUNT(*) FROM <referenced schema>.<referenced table>
+EXPLAIN SELECT COUNT(*) FROM <referenced schema>.<referenced table>
 ```
 **1.1** If the number of rows is less than `max-fk-samples`, all rows are retrieved from the referenced table using this query: 
 ```
@@ -153,6 +153,20 @@ tcol28: 6.12
 1 row in set (0.00 sec)
 ```
 
+## How to download the precompiled binaries
+
+There are binaries available for each version for Linux and Darwin. You can find compiled binaries for each version in the releases tab:
+
+https://github.com/Percona-Lab/mysql_random_data_load/releases
+
+You can copy a link for the binary you want (in this case for 1.0.5), and use wget to download:
+
+```
+cd ~/bin/
+wget https://github.com/Percona-Lab/mysql_random_data_load/releases/download/0.1.5/mysql_random_data_load_linux_amd64
+chmod +x mysql_random_data_load_linux_amd64
+```
+
 ## To do
 - [ ] Add suport for all data types.
 - [X] Add supporrt for foreign keys.

tableparser/tableparser.go

@@ -32,7 +32,7 @@ type IndexField struct {
 	SeqInIndex   int
 	ColumnName   string
 	Collation    sql.NullString
-	Cardinality  int
+	Cardinality  sql.NullInt64
 	SubPart      sql.NullInt64
 	Packed       sql.NullString
 	Null         string