Version 5.1.4

Released on 2023-02-01.


If you are upgrading a cluster, you must be running CrateDB 4.0.2 or higher before you upgrade to 5.1.4.

We recommend that you upgrade to the latest 5.0 release before moving to 5.1.4.

A rolling upgrade from 5.0.x to 5.1.4 is supported. Before upgrading, you should back up your data.


Tables that were created before CrateDB 4.x will not function with 5.x and must be recreated before moving to 5.x.x.

You can recreate tables using COPY TO and COPY FROM or by inserting the data into a new table.

Table of Contents

See the Version 5.1.0 release notes for a full list of changes in the 5.1 series.


  • Added validation to reject inner column names containing special whitespace characters to avoid invalid schema definitions.

  • Fixed an issue that caused the returned column names to be missing the subscripts when querying sub-columns of nested object arrays.

  • Fixed an issue that caused ClassCastException when accessing a sub-column of a nested object array where the sub-column resolves to a nested array. e.g.:

    CREATE TABLE test (
      "a" ARRAY(OBJECT AS (
        "b" ARRAY(OBJECT AS (
          "s" STRING
    INSERT INTO test (a) VALUES ([{b=[{s='1'}, {s='2'}, {s='3'}]}]);
    SELECT a['b'] FROM test; // a['b'] is type of array(array(object))
  • Fixed an issue in the PostgreSQL wire protocol that would cause de-serialization of arrays to fail if they contained unquoted strings consisting of more than 2 words.