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Speeding up comment-ltree migration, fixing index creation. Fixes #2664
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@ -60,6 +60,21 @@ FROM q
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ORDER BY
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ORDER BY
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breadcrumb;
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breadcrumb;
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-- Remove indexes and foreign key constraints, and disable triggers for faster updates
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set session_replication_role = 'replica';
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alter table comment disable trigger all;
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alter table comment drop constraint comment_creator_id_fkey;
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alter table comment drop constraint comment_parent_id_fkey;
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alter table comment drop constraint comment_post_id_fkey;
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alter table comment drop constraint idx_comment_ap_id;
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drop index
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idx_comment_creator,
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idx_comment_parent,
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idx_comment_post,
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idx_comment_published;
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-- Add the ltree column
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-- Add the ltree column
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update comment c
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update comment c
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set path = ct.ltree_path
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set path = ct.ltree_path
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@ -75,9 +90,24 @@ from (
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) as c2
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) as c2
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where ca.comment_id = c2.id;
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where ca.comment_id = c2.id;
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-- Delete comments with more than 150 children, otherwise the index creation below will fail
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delete from comment where nlevel(path) > 150;
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-- Re-enable old constraints and indexes
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alter table comment add constraint "comment_creator_id_fkey" FOREIGN KEY (creator_id) REFERENCES person(id) ON UPDATE CASCADE ON DELETE CASCADE;
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alter table comment add constraint "comment_post_id_fkey" FOREIGN KEY (post_id) REFERENCES post(id) ON UPDATE CASCADE ON DELETE CASCADE;
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alter table comment add constraint "idx_comment_ap_id" unique (ap_id);
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create index idx_comment_creator on comment (creator_id);
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create index idx_comment_post on comment (post_id);
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create index idx_comment_published on comment (published desc);
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-- Create the index
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-- Create the index
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create index idx_path_gist on comment using gist (path);
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create index idx_path_gist on comment using gist (path);
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-- Drop the parent_id column
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-- Drop the parent_id column
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alter table comment drop column parent_id cascade;
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alter table comment drop column parent_id cascade;
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set session_replication_role = 'origin';
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alter table comment enable trigger all;
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