10 calls to db_field_exists()

comment_update_8001 in drupal/core/modules/comment/comment.install
Create a UUID column for comments.
field_sql_storage_update_8000 in drupal/core/modules/field/modules/field_sql_storage/field_sql_storage.install
Changes field language into langcode.
node_update_8004 in drupal/core/modules/node/node.install
Create a UUID column for nodes.
RegressionTest::testDBFieldExists in drupal/core/modules/system/lib/Drupal/system/Tests/Database/RegressionTest.php
Tests the db_field_exists() function.
SchemaTest::testUnsignedColumns in drupal/core/modules/system/lib/Drupal/system/Tests/Common/SchemaTest.php
Tests creating unsigned columns and data integrity thereof.
taxonomy_update_8001 in drupal/core/modules/taxonomy/taxonomy.install
Adds langcode field to {taxonomy_term_data} and {taxonomy_vocabulary}.
taxonomy_update_8002 in drupal/core/modules/taxonomy/taxonomy.install
Create a UUID column for taxonomy terms.
update_prepare_d8_bootstrap in drupal/core/includes/update.inc
Performs extra steps required to bootstrap when using a Drupal 7 database.
update_prepare_d8_language in drupal/core/includes/update.inc
Prepare Drupal 8 language changes for the bootstrap if needed.
user_update_8003 in drupal/core/modules/user/user.install
Create a UUID column for users.