ER_BAD_FIELD_ERROR: Unknown column 'i.EXPRESSION' in query getConstraintColumns

[jirapatk]

I'm experiencing an issue with the database analysis tool when running a query to get constraint columns. The error message is:
Local gateway: Internal Server Error: Error ER_BAD_FIELD_ERROR on query getConstraintColumns: Unknown column 'i.EXPRESSION' in 'field list'
The query that's causing the error is:

sql

SELECT
c.CONSTRAINT_NAME AS constraint_name,
c.CONSTRAINT_TYPE AS constraint_type,
c.TABLE_SCHEMA AS table_schema,
c.TABLE_NAME AS table_name,
cc.ORDINAL_POSITION AS column_index,
cc.COLUMN_NAME AS column_name,
null AS column_expr,
cc.REFERENCED_TABLE_SCHEMA AS ref_schema,
cc.REFERENCED_TABLE_NAME AS ref_table,
cc.REFERENCED_COLUMN_NAME AS ref_column
FROM
information_schema.TABLE_CONSTRAINTS c
LEFT JOIN information_schema.KEY_COLUMN_USAGE cc
ON cc.CONSTRAINT_CATALOG = c.CONSTRAINT_CATALOG
AND cc.CONSTRAINT_SCHEMA = c.CONSTRAINT_SCHEMA
AND cc.CONSTRAINT_NAME = c.CONSTRAINT_NAME
AND cc.TABLE_NAME = c.TABLE_NAME
WHERE
c.CONSTRAINT_TYPE != 'CHECK'
AND c.TABLE_SCHEMA = 'hqms'
UNION
SELECT
i.INDEX_NAME AS constraint_name,
"INDEX" AS constraint_type,
i.TABLE_SCHEMA AS table_schema,
i.TABLE_NAME AS table_name,
i.SEQ_IN_INDEX AS column_index,
i.COLUMN_NAME AS column_name,
i.EXPRESSION AS column_expr,
null AS ref_schema,
null AS ref_table,
null AS ref_column
FROM
information_schema.STATISTICS i
LEFT JOIN information_schema.TABLE_CONSTRAINTS c
ON c.TABLE_SCHEMA = i.TABLE_SCHEMA
AND c.TABLE_NAME = i.TABLE_NAME
AND c.CONSTRAINT_NAME = i.INDEX_NAME
WHERE
c.CONSTRAINT_TYPE IS NULL
AND i.TABLE_SCHEMA = 'hqms'
ORDER BY
table_schema, table_name, constraint_name, column_index;