Peter Rozsa 3247cc6839
IMPALA-10173: Allow implicit casts between numeric and string types when inserting into table ...
This patch adds an expiremental query option called ALLOW_UNSAFE_CASTS
which allows implicit casting between some numeric types and string
types. A new type of compatibility is introduced for this purpose, and
the compatibility rule handling is refactored also. The new approach
uses an enum to differentiate the compatibility levels, and to make it
easier to pass them through methods. The unsafe compatibility is used
only in two cases: for set operations and for insert statements. The
insert statements and set operations accept unsafe implicitly casted
expressions only when the source expressions are constant.
The following implicit type casts are enabled in unsafe mode:
- String -> Float, Double
- String -> Tinyint, Smallint, Int, Bigint
- Float, Double -> String
- Tinyint, Smallint, Int, Bigint -> String
The patch also covers IMPALA-3217, and adds two more rules to handle
implicit casting in set operations and insert statements between string
types:
- String -> Char(n)
- String -> Varchar(n)
The unsafe implicit casting requires that the source expression must be
constant in this case as well.
Tests:
- tests added to AnalyzeExprsTest.java
- new test class added to test_insert.py
Change-Id: Iee5db2301216c2e088b4b3e4f6cb5a1fd10600f7
Reviewed-on: http://gerrit.cloudera.org:8080/19881
Reviewed-by: Daniel Becker <daniel.becker@cloudera.com >
Tested-by: Impala Public Jenkins <impala-public-jenkins@cloudera.com >
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