mentat/db/src/entids.rs

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// Copyright 2016 Mozilla
//
// Licensed under the Apache License, Version 2.0 (the "License"); you may not use
// this file except in compliance with the License. You may obtain a copy of the
// License at http://www.apache.org/licenses/LICENSE-2.0
// Unless required by applicable law or agreed to in writing, software distributed
// under the License is distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR
// CONDITIONS OF ANY KIND, either express or implied. See the License for the
// specific language governing permissions and limitations under the License.
#![allow(dead_code)]
/// Literal `Entid` values in the the "db" namespace.
///
/// Used through-out the transactor to match core DB constructs.
use types::{Entid};
// Added in SQL schema v1.
pub const DB_IDENT: Entid = 1;
pub const DB_PART_DB: Entid = 2;
pub const DB_TX_INSTANT: Entid = 3;
pub const DB_INSTALL_PARTITION: Entid = 4;
Schema alteration. Fixes #294 and #295. (#370) r=rnewman * Pre: Don't retract :db/ident in test. Datomic (and eventually Mentat) don't allow to retract :db/ident in this way, so this runs afoul of future work to support mutating metadata. * Pre: s/VALUETYPE/VALUE_TYPE/. This is consistent with the capitalization (which is "valueType") and the other identifier. * Pre: Remove some single quotes from error output. * Part 1: Make materialized views be uniform [e a v value_type_tag]. This looks ahead to a time when we could support arbitrary user-defined materialized views. For now, the "idents" materialized view is those datoms of the form [e :db/ident :namespaced/keyword] and the "schema" materialized view is those datoms of the form [e a v] where a is in a particular set of attributes that will become clear in the following commits. This change is not backwards compatible, so I'm removing the open current (really, v2) test. It'll be re-instated when we get to https://github.com/mozilla/mentat/issues/194. * Pre: Map TypedValue::Ref to TypedValue::Keyword in debug output. * Part 3: Separate `schema_to_mutate` from the `schema` used to interpret. This is just to keep track of the expected changes during bootstrapping. I want bootstrap metadata mutations to flow through the same code path as metadata mutations during regular transactions; by differentiating the schema used for interpretation from the schema that will be updated I expect to be able to apply bootstrap metadata mutations to an empty schema and have things like materialized views created (using the regular code paths). This commit has been re-ordered for conceptual clarity, but it won't compile because it references the metadata module. It's possible to make it compile -- the functionality is there in the schema module -- but it's not worth the rebasing effort until after review (and possibly not even then, since we'll squash down to a single commit to land). * Part 2: Maintain entids separately from idents. In order to support historical idents, we need to distinguish the "current" map from entid -> ident from the "complete historical" map ident -> entid. This is what Datomic does; in Datomic, an ident is never retracted (although it can be replaced). This approach is an important part of allowing multiple consumers to share a schema fragment as it migrates forward. This fixes a limitation of the Clojure implementation, which did not handle historical idents across knowledge base close and re-open. The "entids" materialized view is naturally a slice of the "datoms" table. The "idents" materialized view is a slice of the "transactions" table. I hope that representing in this way, and casting the problem in this light, might generalize to future materialized views. * Pre: Add DiffSet. * Part 4: Collect mutations to a `Schema`. I haven't taken your review comment about consuming AttributeBuilder during each fluent function. If you read my response and still want this, I'm happy to do it in review. * Part 5: Handle :db/ident and :db.{install,alter}/attribute. This "loops" the committed datoms out of the SQL store and back through the metadata (schema, but in future also partition map) processor. The metadata processor updates the schema and produces a report of what changed; that report is then used to update the SQL store. That update includes: - the materialized views ("entids", "idents", and "schema"); - if needed, a subset of the datoms themselves (as flags change). I've left a TODO for handling attribute retraction in the cases that it makes sense. I expect that to be straight-forward. * Review comment: Rename DiffSet to AddRetractAlterSet. Also adds a little more commentary and a simple test. * Review comment: Use ToIdent trait. * Review comment: partially revert "Part 2: Maintain entids separately from idents." This reverts commit 23a91df9c35e14398f2ddbd1ba25315821e67401. Following our discussion, this removes the "entids" materialized view. The next commit will remove historical idents from the "idents" materialized view. * Post: Use custom Either rather than std::result::Result. This is not necessary, but it was suggested that we might be paying an overhead creating Err instances while using error_chain. That seems not to be the case, but this change shows that we don't actually use any of the Result helper methods, so there's no reason to overload Result. This change might avoid some future confusion, so I'm going to land it anyway. Signed-off-by: Nick Alexander <nalexander@mozilla.com> * Review comment: Don't preserve historical idents. * Review comment: More prepared statements when updating materialized views. * Post: Test altering :db/cardinality and :db/unique. These tests fail due to a Datomic limitation, namely that the marker flag :db.alter/attribute can only be asserted once for an attribute! That is, [:db.part/db :db.alter/attribute :attribute] will only be transacted at most once. Since older versions of Datomic required the :db.alter/attribute flag, I can only imagine they either never wrote :db.alter/attribute to the store, or they handled it specially. I'll need to remove the marker flag system from Mentat in order to address this fundamental limitation. * Post: Remove some more single quotes from error output. * Post: Add assert_transact! macro to unwrap safely. I was finding it very difficult to track unwrapping errors while making changes, due to an underlying Mac OS X symbolication issue that makes running tests with RUST_BACKTRACE=1 so slow that they all time out. * Post: Don't expect or recognize :db.{install,alter}/attribute. I had this all working... except we will never see a repeated `[:db.part/db :db.alter/attribute :attribute]` assertion in the store! That means my approach would let you alter an attribute at most one time. It's not worth hacking around this; it's better to just stop expecting (and recognizing) the marker flags. (We have all the data to distinguish the various cases that we need without the marker flags.) This brings Mentat in line with the thrust of newer Datomic versions, but isn't compatible with Datomic, because (if I understand correctly) Datomic automatically adds :db.{install,alter}/attribute assertions to transactions. I haven't purged the corresponding :db/ident and schema fragments just yet: - we might want them back - we might want them in order to upgrade v1 and v2 databases to the new on-disk layout we're fleshing out (v3?). * Post: Don't make :db/unique :db.unique/* imply :db/index true. This patch avoids a potential bug with the "schema" materialized view. If :db/unique :db.unique/value implies :db/index true, then what happens when you _retract_ :db.unique/value? I think Datomic defines this in some way, but I really want the "schema" materialized view to be a slice of "datoms" and not have these sort of ambiguities and persistent effects. Therefore, to ensure that we don't retract a schema characteristic and accidentally change more than we intended to, this patch stops having any schema characteristic imply any other schema characteristic(s). To achieve that, I added an Option<Unique::{Value,Identity}> type to Attribute; this helps with this patch, and also looks ahead to when we allow to retract :db/unique attributes. * Post: Allow to retract :db/ident. * Post: Include more details about invalid schema changes. The tests use strings, so they hide the chained errors which do in fact provide more detail. * Review comment: Fix outdated comment. * Review comment: s/_SET/_SQL_LIST/. * Review comment: Use a sub-select for checking cardinality. This might be faster in practice. * Review comment: Put `attribute::Unique` into its own namespace.
2017-03-20 20:18:59 +00:00
pub const DB_INSTALL_VALUE_TYPE: Entid = 5;
pub const DB_INSTALL_ATTRIBUTE: Entid = 6;
pub const DB_VALUE_TYPE: Entid = 7;
pub const DB_CARDINALITY: Entid = 8;
pub const DB_UNIQUE: Entid = 9;
pub const DB_IS_COMPONENT: Entid = 10;
pub const DB_INDEX: Entid = 11;
pub const DB_FULLTEXT: Entid = 12;
pub const DB_NO_HISTORY: Entid = 13;
pub const DB_ADD: Entid = 14;
pub const DB_RETRACT: Entid = 15;
pub const DB_PART_USER: Entid = 16;
pub const DB_PART_TX: Entid = 17;
pub const DB_EXCISE: Entid = 18;
pub const DB_EXCISE_ATTRS: Entid = 19;
pub const DB_EXCISE_BEFORE_T: Entid = 20;
pub const DB_EXCISE_BEFORE: Entid = 21;
pub const DB_ALTER_ATTRIBUTE: Entid = 22;
pub const DB_TYPE_REF: Entid = 23;
pub const DB_TYPE_KEYWORD: Entid = 24;
pub const DB_TYPE_LONG: Entid = 25;
pub const DB_TYPE_DOUBLE: Entid = 26;
pub const DB_TYPE_STRING: Entid = 27;
pub const DB_TYPE_BOOLEAN: Entid = 28;
pub const DB_TYPE_INSTANT: Entid = 29;
pub const DB_TYPE_BYTES: Entid = 30;
pub const DB_CARDINALITY_ONE: Entid = 31;
pub const DB_CARDINALITY_MANY: Entid = 32;
pub const DB_UNIQUE_VALUE: Entid = 33;
pub const DB_UNIQUE_IDENTITY: Entid = 34;
pub const DB_DOC: Entid = 35;
// Added in SQL schema v2.
pub const DB_SCHEMA_VERSION: Entid = 36;
pub const DB_SCHEMA_ATTRIBUTE: Entid = 37;
Schema alteration. Fixes #294 and #295. (#370) r=rnewman * Pre: Don't retract :db/ident in test. Datomic (and eventually Mentat) don't allow to retract :db/ident in this way, so this runs afoul of future work to support mutating metadata. * Pre: s/VALUETYPE/VALUE_TYPE/. This is consistent with the capitalization (which is "valueType") and the other identifier. * Pre: Remove some single quotes from error output. * Part 1: Make materialized views be uniform [e a v value_type_tag]. This looks ahead to a time when we could support arbitrary user-defined materialized views. For now, the "idents" materialized view is those datoms of the form [e :db/ident :namespaced/keyword] and the "schema" materialized view is those datoms of the form [e a v] where a is in a particular set of attributes that will become clear in the following commits. This change is not backwards compatible, so I'm removing the open current (really, v2) test. It'll be re-instated when we get to https://github.com/mozilla/mentat/issues/194. * Pre: Map TypedValue::Ref to TypedValue::Keyword in debug output. * Part 3: Separate `schema_to_mutate` from the `schema` used to interpret. This is just to keep track of the expected changes during bootstrapping. I want bootstrap metadata mutations to flow through the same code path as metadata mutations during regular transactions; by differentiating the schema used for interpretation from the schema that will be updated I expect to be able to apply bootstrap metadata mutations to an empty schema and have things like materialized views created (using the regular code paths). This commit has been re-ordered for conceptual clarity, but it won't compile because it references the metadata module. It's possible to make it compile -- the functionality is there in the schema module -- but it's not worth the rebasing effort until after review (and possibly not even then, since we'll squash down to a single commit to land). * Part 2: Maintain entids separately from idents. In order to support historical idents, we need to distinguish the "current" map from entid -> ident from the "complete historical" map ident -> entid. This is what Datomic does; in Datomic, an ident is never retracted (although it can be replaced). This approach is an important part of allowing multiple consumers to share a schema fragment as it migrates forward. This fixes a limitation of the Clojure implementation, which did not handle historical idents across knowledge base close and re-open. The "entids" materialized view is naturally a slice of the "datoms" table. The "idents" materialized view is a slice of the "transactions" table. I hope that representing in this way, and casting the problem in this light, might generalize to future materialized views. * Pre: Add DiffSet. * Part 4: Collect mutations to a `Schema`. I haven't taken your review comment about consuming AttributeBuilder during each fluent function. If you read my response and still want this, I'm happy to do it in review. * Part 5: Handle :db/ident and :db.{install,alter}/attribute. This "loops" the committed datoms out of the SQL store and back through the metadata (schema, but in future also partition map) processor. The metadata processor updates the schema and produces a report of what changed; that report is then used to update the SQL store. That update includes: - the materialized views ("entids", "idents", and "schema"); - if needed, a subset of the datoms themselves (as flags change). I've left a TODO for handling attribute retraction in the cases that it makes sense. I expect that to be straight-forward. * Review comment: Rename DiffSet to AddRetractAlterSet. Also adds a little more commentary and a simple test. * Review comment: Use ToIdent trait. * Review comment: partially revert "Part 2: Maintain entids separately from idents." This reverts commit 23a91df9c35e14398f2ddbd1ba25315821e67401. Following our discussion, this removes the "entids" materialized view. The next commit will remove historical idents from the "idents" materialized view. * Post: Use custom Either rather than std::result::Result. This is not necessary, but it was suggested that we might be paying an overhead creating Err instances while using error_chain. That seems not to be the case, but this change shows that we don't actually use any of the Result helper methods, so there's no reason to overload Result. This change might avoid some future confusion, so I'm going to land it anyway. Signed-off-by: Nick Alexander <nalexander@mozilla.com> * Review comment: Don't preserve historical idents. * Review comment: More prepared statements when updating materialized views. * Post: Test altering :db/cardinality and :db/unique. These tests fail due to a Datomic limitation, namely that the marker flag :db.alter/attribute can only be asserted once for an attribute! That is, [:db.part/db :db.alter/attribute :attribute] will only be transacted at most once. Since older versions of Datomic required the :db.alter/attribute flag, I can only imagine they either never wrote :db.alter/attribute to the store, or they handled it specially. I'll need to remove the marker flag system from Mentat in order to address this fundamental limitation. * Post: Remove some more single quotes from error output. * Post: Add assert_transact! macro to unwrap safely. I was finding it very difficult to track unwrapping errors while making changes, due to an underlying Mac OS X symbolication issue that makes running tests with RUST_BACKTRACE=1 so slow that they all time out. * Post: Don't expect or recognize :db.{install,alter}/attribute. I had this all working... except we will never see a repeated `[:db.part/db :db.alter/attribute :attribute]` assertion in the store! That means my approach would let you alter an attribute at most one time. It's not worth hacking around this; it's better to just stop expecting (and recognizing) the marker flags. (We have all the data to distinguish the various cases that we need without the marker flags.) This brings Mentat in line with the thrust of newer Datomic versions, but isn't compatible with Datomic, because (if I understand correctly) Datomic automatically adds :db.{install,alter}/attribute assertions to transactions. I haven't purged the corresponding :db/ident and schema fragments just yet: - we might want them back - we might want them in order to upgrade v1 and v2 databases to the new on-disk layout we're fleshing out (v3?). * Post: Don't make :db/unique :db.unique/* imply :db/index true. This patch avoids a potential bug with the "schema" materialized view. If :db/unique :db.unique/value implies :db/index true, then what happens when you _retract_ :db.unique/value? I think Datomic defines this in some way, but I really want the "schema" materialized view to be a slice of "datoms" and not have these sort of ambiguities and persistent effects. Therefore, to ensure that we don't retract a schema characteristic and accidentally change more than we intended to, this patch stops having any schema characteristic imply any other schema characteristic(s). To achieve that, I added an Option<Unique::{Value,Identity}> type to Attribute; this helps with this patch, and also looks ahead to when we allow to retract :db/unique attributes. * Post: Allow to retract :db/ident. * Post: Include more details about invalid schema changes. The tests use strings, so they hide the chained errors which do in fact provide more detail. * Review comment: Fix outdated comment. * Review comment: s/_SET/_SQL_LIST/. * Review comment: Use a sub-select for checking cardinality. This might be faster in practice. * Review comment: Put `attribute::Unique` into its own namespace.
2017-03-20 20:18:59 +00:00
/// Return `false` if the given attribute will not change the metadata: recognized idents, schema,
/// partitions in the partition map.
pub fn might_update_metadata(attribute: Entid) -> bool {
if attribute > DB_DOC {
return false
}
match attribute {
// Idents.
DB_IDENT |
// Schema.
DB_CARDINALITY |
DB_DOC |
DB_FULLTEXT |
DB_INDEX |
DB_IS_COMPONENT |
DB_UNIQUE |
DB_VALUE_TYPE =>
true,
_ => false,
}
}
lazy_static! {
/// Attributes that are "ident related". These might change the "idents" materialized view.
pub static ref IDENTS_SQL_LIST: String = {
format!("({})",
DB_IDENT)
};
/// Attributes that are "schema related". These might change the "schema" materialized view.
pub static ref SCHEMA_SQL_LIST: String = {
format!("({}, {}, {}, {}, {}, {}, {})",
DB_CARDINALITY,
DB_DOC,
DB_FULLTEXT,
DB_INDEX,
DB_IS_COMPONENT,
DB_UNIQUE,
DB_VALUE_TYPE)
};
/// Attributes that are "metadata" related. These might change one of the materialized views.
pub static ref METADATA_SQL_LIST: String = {
format!("({}, {}, {}, {}, {}, {}, {}, {})",
DB_CARDINALITY,
DB_DOC,
DB_FULLTEXT,
DB_IDENT,
DB_INDEX,
DB_IS_COMPONENT,
DB_UNIQUE,
DB_VALUE_TYPE)
};
}