Suppose we have this structure:

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Person:
  columns:
    name: string(63)

Professor:
  inheritance:
    extends: Person
    type: column_aggregation
    keyField: type
    keyValue: professor
  columns:
    faculty_id: integer(10)
  relations:
    Faculty:

Student:
  inheritance:
    extends: Person
    type: column_aggregation
    keyField: type
    keyValue: student

When you run the symfony:build —all task you get a really annoying error:

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SQLSTATE[42000]: Syntax error or access violation: 1072 Key column faculty_id doesnt exist in table. 

Failing Query: 
CREATE TABLE person (
    id BIGINT AUTO_INCREMENT, 
    name VARCHAR(63), 
    type VARCHAR(31), 
    INDEX faculty_id_idx (faculty_id), 
    PRIMARY KEY(id)) ENGINE = INNODB.

The problem: the Doctrine CLI task tries to insert multiple CREATE TABLE queries (one for each child + for the parant).

Luckily you can circumvent this behavior by calling (in the setUp method):

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$this->setAttribute(Doctrine_Core::ATTR_EXPORT, Doctrine_Core::EXPORT_NONE);