Enum QueryExpr 

pub enum QueryExpr {
    Table(TableQuery),
    Graph(GraphQuery),
    Join(JoinQuery),
    Path(PathQuery),
    Vector(VectorQuery),
    Hybrid(HybridQuery),
    Insert(InsertQuery),
    Update(UpdateQuery),
    Delete(DeleteQuery),
    CreateTable(CreateTableQuery),
    CreateCollection(CreateCollectionQuery),
    CreateVector(CreateVectorQuery),
    DropTable(DropTableQuery),
    DropGraph(DropGraphQuery),
    DropVector(DropVectorQuery),
    DropDocument(DropDocumentQuery),
    DropKv(DropKvQuery),
    DropCollection(DropCollectionQuery),
    Truncate(TruncateQuery),
    AlterTable(AlterTableQuery),
    GraphCommand(GraphCommand),
    SearchCommand(SearchCommand),
    Ask(AskQuery),
    CreateIndex(CreateIndexQuery),
    DropIndex(DropIndexQuery),
    ProbabilisticCommand(ProbabilisticCommand),
    CreateTimeSeries(CreateTimeSeriesQuery),
    DropTimeSeries(DropTimeSeriesQuery),
    CreateQueue(CreateQueueQuery),
    AlterQueue(AlterQueueQuery),
    DropQueue(DropQueueQuery),
    QueueSelect(QueueSelectQuery),
    QueueCommand(QueueCommand),
    KvCommand(KvCommand),
    ConfigCommand(ConfigCommand),
    CreateTree(CreateTreeQuery),
    DropTree(DropTreeQuery),
    TreeCommand(TreeCommand),
    SetConfig {
        key: String,
        value: Value,
    },
    ShowConfig {
        prefix: Option<String>,
    },
    SetSecret {
        key: String,
        value: Value,
    },
    DeleteSecret {
        key: String,
    },
    ShowSecrets {
        prefix: Option<String>,
    },
    SetTenant(Option<String>),
    ShowTenant,
    ExplainAlter(ExplainAlterQuery),
    CreateMigration(CreateMigrationQuery),
    ApplyMigration(ApplyMigrationQuery),
    RollbackMigration(RollbackMigrationQuery),
    ExplainMigration(ExplainMigrationQuery),
    EventsBackfill(EventsBackfillQuery),
    EventsBackfillStatus {
        collection: String,
    },
    TransactionControl(TxnControl),
    MaintenanceCommand(MaintenanceCommand),
    CreateSchema(CreateSchemaQuery),
    DropSchema(DropSchemaQuery),
    CreateSequence(CreateSequenceQuery),
    DropSequence(DropSequenceQuery),
    CopyFrom(CopyFromQuery),
    CreateView(CreateViewQuery),
    DropView(DropViewQuery),
    RefreshMaterializedView(RefreshMaterializedViewQuery),
    CreatePolicy(CreatePolicyQuery),
    DropPolicy(DropPolicyQuery),
    CreateServer(CreateServerQuery),
    DropServer(DropServerQuery),
    CreateForeignTable(CreateForeignTableQuery),
    DropForeignTable(DropForeignTableQuery),
    Grant(GrantStmt),
    Revoke(RevokeStmt),
    AlterUser(AlterUserStmt),
    CreateIamPolicy {
        id: String,
        json: String,
    },
    DropIamPolicy {
        id: String,
    },
    AttachPolicy {
        policy_id: String,
        principal: PolicyPrincipalRef,
    },
    DetachPolicy {
        policy_id: String,
        principal: PolicyPrincipalRef,
    },
    ShowPolicies {
        filter: Option<PolicyPrincipalRef>,
    },
    ShowEffectivePermissions {
        user: PolicyUserRef,
        resource: Option<PolicyResourceRef>,
    },
    SimulatePolicy {
        user: PolicyUserRef,
        action: String,
        resource: PolicyResourceRef,
    },
}

Root query expression

Variants

Table(TableQuery)

Pure table query: SELECT … FROM …

Graph(GraphQuery)

Pure graph query: MATCH … RETURN …

Join(JoinQuery)

Join between table and graph

Path(PathQuery)

Path query: PATH FROM … TO …

Vector(VectorQuery)

Vector similarity search

Hybrid(HybridQuery)

Hybrid query combining structured and vector search

Insert(InsertQuery)

INSERT INTO table (cols) VALUES (vals)

Update(UpdateQuery)

UPDATE table SET col=val WHERE filter

Delete(DeleteQuery)

DELETE FROM table WHERE filter

CreateTable(CreateTableQuery)

CREATE TABLE name (columns)

CreateCollection(CreateCollectionQuery)

CREATE COLLECTION name KIND kind

CreateVector(CreateVectorQuery)

CREATE VECTOR name DIM n [METRIC metric]

DropTable(DropTableQuery)

DROP TABLE name

DropGraph(DropGraphQuery)

DROP GRAPH name

DropVector(DropVectorQuery)

DROP VECTOR name

DropDocument(DropDocumentQuery)

DROP DOCUMENT name

DropKv(DropKvQuery)

DROP KV name

DropCollection(DropCollectionQuery)

DROP COLLECTION name

Truncate(TruncateQuery)

TRUNCATE [model] name

AlterTable(AlterTableQuery)

ALTER TABLE name ADD/DROP/RENAME COLUMN

GraphCommand(GraphCommand)

GRAPH subcommand (NEIGHBORHOOD, SHORTEST_PATH, etc.)

SearchCommand(SearchCommand)

SEARCH subcommand (SIMILAR, TEXT, HYBRID)

Ask(AskQuery)

ASK ‘question’ — RAG query with LLM synthesis

CreateIndex(CreateIndexQuery)

CREATE INDEX name ON table (columns) USING type

DropIndex(DropIndexQuery)

DROP INDEX name ON table

ProbabilisticCommand(ProbabilisticCommand)

Probabilistic data structure commands (HLL, SKETCH, FILTER)

CreateTimeSeries(CreateTimeSeriesQuery)

CREATE TIMESERIES name [RETENTION duration] [CHUNK_SIZE n]

DropTimeSeries(DropTimeSeriesQuery)

DROP TIMESERIES name

CreateQueue(CreateQueueQuery)

CREATE QUEUE name [MAX_SIZE n] [PRIORITY] [WITH TTL duration]

AlterQueue(AlterQueueQuery)

ALTER QUEUE name SET MODE [FANOUT|WORK]

DropQueue(DropQueueQuery)

DROP QUEUE name

QueueSelect(QueueSelectQuery)

Read-only queue projection: SELECT … FROM QUEUE name

QueueCommand(QueueCommand)

QUEUE subcommand (PUSH, POP, PEEK, LEN, PURGE, GROUP, READ, ACK, NACK)

KvCommand(KvCommand)

KV subcommand (PUT, GET, DELETE)

ConfigCommand(ConfigCommand)

CONFIG keyed command (PUT, GET, ROTATE, DELETE, HISTORY)

CreateTree(CreateTreeQuery)

CREATE TREE name IN collection ROOT … MAX_CHILDREN n

DropTree(DropTreeQuery)

DROP TREE name IN collection

TreeCommand(TreeCommand)

TREE subcommand (INSERT, MOVE, DELETE, VALIDATE, REBALANCE)

SetConfig

SET CONFIG key = value

Fields

key: String

value: Value

ShowConfig

SHOW CONFIG [prefix]

Fields

prefix: Option<String>

SetSecret

SET SECRET key = value

Fields

key: String

value: Value

DeleteSecret

DELETE SECRET key

Fields

key: String

ShowSecrets

SHOW SECRET[S] [prefix]

Fields

prefix: Option<String>

SetTenant(Option<String>)

SET TENANT 'id' / SET TENANT = 'id' / RESET TENANT

Session-scoped multi-tenancy handle. Populates a per-connection thread-local that CURRENT_TENANT() reads and that RLS policies combine with via USING (tenant_id = CURRENT_TENANT()). None clears the current tenant (RESET TENANT or SET TENANT NULL). Unlike SetConfig this is not persisted to red_config — it lives for the connection’s lifetime only.

ShowTenant

SHOW TENANT — returns the thread-local tenant id (or NULL).

ExplainAlter(ExplainAlterQuery)

EXPLAIN ALTER FOR CREATE TABLE name (…) [FORMAT JSON]

Pure read command that diffs the embedded CREATE TABLE statement against the live CollectionContract of the table with the same name and returns the ALTER TABLE operations that would close the gap. Never executes anything — output is text (default) or JSON depending on the optional FORMAT JSON suffix. Powers the Purple framework’s migration generator and any other client that wants reddb to own the schema-diff rules.

CreateMigration(CreateMigrationQuery)

CREATE MIGRATION name [DEPENDS ON dep1, dep2] [BATCH n ROWS] [NO ROLLBACK] body

ApplyMigration(ApplyMigrationQuery)

APPLY MIGRATION name | APPLY MIGRATION * [FOR TENANT id]

RollbackMigration(RollbackMigrationQuery)

ROLLBACK MIGRATION name

ExplainMigration(ExplainMigrationQuery)

EXPLAIN MIGRATION name

EventsBackfill(EventsBackfillQuery)

EVENTS BACKFILL collection [WHERE pred] TO queue [LIMIT n].

EventsBackfillStatus

EVENTS BACKFILL STATUS collection placeholder for the status slice.

Fields

collection: String

TransactionControl(TxnControl)

Transaction control: BEGIN, COMMIT, ROLLBACK, SAVEPOINT, RELEASE, ROLLBACK TO.

Phase 1.1 (PG parity): parser + dispatch are wired so clients (psql, JDBC, etc.) can issue these statements without errors. Real isolation/atomicity semantics arrive with Phase 2.3 MVCC. Until then statements behave as autocommit (each DML is its own transaction); BEGIN/COMMIT/ROLLBACK return success but do NOT provide rollback-on-failure guarantees across multiple statements.

MaintenanceCommand(MaintenanceCommand)

Maintenance commands: VACUUM [FULL] [table], ANALYZE [table].

Phase 1.2 (PG parity): VACUUM triggers segment/page flush + planner stats refresh. ANALYZE refreshes planner statistics (histograms, null counts, distinct estimates). Both accept an optional table target; omitting the target iterates every collection.

CreateSchema(CreateSchemaQuery)

CREATE SCHEMA [IF NOT EXISTS] name

Phase 1.3 (PG parity): schemas are logical namespaces stored in red_config under the key schema.{name}. Tables created inside a schema use schema.table qualified names (collection name = “schema.table”).

DropSchema(DropSchemaQuery)

DROP SCHEMA [IF EXISTS] name [CASCADE]

CreateSequence(CreateSequenceQuery)

CREATE SEQUENCE [IF NOT EXISTS] name [START [WITH] n] [INCREMENT [BY] n]

Phase 1.3 (PG parity): sequences are 64-bit monotonic counters persisted in red_config under the key sequence.{name}. Values are produced by the scalar functions nextval('name') and currval('name').

DropSequence(DropSequenceQuery)

DROP SEQUENCE [IF EXISTS] name

CopyFrom(CopyFromQuery)

COPY table FROM 'path' [WITH ...] — CSV import (Phase 1.5 PG parity).

Supported options: DELIMITER c, HEADER [true|false]. Rows stream into the named collection via the CsvImporter.

CreateView(CreateViewQuery)

CREATE [OR REPLACE] [MATERIALIZED] VIEW [IF NOT EXISTS] name AS SELECT ...

Phase 2.1 (PG parity): views are stored as view.{name} entries in red_config. Materialized views additionally allocate a slot in the shared MaterializedViewCache; REFRESH MATERIALIZED VIEW re-runs the underlying query and repopulates the cache.

DropView(DropViewQuery)

DROP [MATERIALIZED] VIEW [IF EXISTS] name

RefreshMaterializedView(RefreshMaterializedViewQuery)

REFRESH MATERIALIZED VIEW name

Re-executes the view’s query and writes the result into the cache.

CreatePolicy(CreatePolicyQuery)

CREATE POLICY name ON table [FOR action] [TO role] USING (filter)

Phase 2.5 (PG parity): row-level security policy definition. Evaluated at read time — when the table has RLS enabled, all matching policies for the current role are combined with OR and AND-ed into the query’s WHERE clause.

DropPolicy(DropPolicyQuery)

DROP POLICY [IF EXISTS] name ON table

CreateServer(CreateServerQuery)

CREATE SERVER name FOREIGN DATA WRAPPER kind OPTIONS (...) (Phase 3.2 PG parity). Registers a named foreign-data-wrapper instance in the runtime’s ForeignTableRegistry.

DropServer(DropServerQuery)

DROP SERVER [IF EXISTS] name [CASCADE]

CreateForeignTable(CreateForeignTableQuery)

CREATE FOREIGN TABLE name (cols) SERVER srv OPTIONS (...) (Phase 3.2 PG parity). Makes name resolvable as a foreign table via the parent server’s ForeignDataWrapper.

DropForeignTable(DropForeignTableQuery)

DROP FOREIGN TABLE [IF EXISTS] name

Grant(GrantStmt)

GRANT { actions | ALL [PRIVILEGES] } ON { TABLE | SCHEMA | DATABASE | FUNCTION } object_list TO grant_principal_list [WITH GRANT OPTION]

Granular RBAC primitive layered on top of the legacy 3-role model. See crate::auth::privileges for the resolution algorithm.

Revoke(RevokeStmt)

REVOKE [GRANT OPTION FOR] { actions | ALL } ON … FROM …

AlterUser(AlterUserStmt)

ALTER USER name [VALID UNTIL 'ts'] [CONNECTION LIMIT n] [ENABLE | DISABLE] [SET search_path = ...]

CreateIamPolicy

CREATE POLICY '<id>' AS '<json>' — installs an IAM policy document in the AuthStore. Distinct from the RLS-flavoured CreatePolicy(CreatePolicyQuery) above (which uses CREATE POLICY name ON table ...); the parser disambiguates at parse time by inspecting the token after the policy name.

Fields

id: String

json: String

DropIamPolicy

DROP POLICY '<id>' — removes an IAM policy and its attachments.

Fields

id: String

AttachPolicy

ATTACH POLICY '<id>' TO USER <name> / ATTACH POLICY '<id>' TO GROUP <name>.

Fields

policy_id: String

principal: PolicyPrincipalRef

DetachPolicy

DETACH POLICY '<id>' FROM USER <name> / DETACH POLICY '<id>' FROM GROUP <name>.

Fields

policy_id: String

principal: PolicyPrincipalRef

ShowPolicies

SHOW POLICIES [FOR USER <name> | FOR GROUP <name>].

Fields

filter: Option<PolicyPrincipalRef>

ShowEffectivePermissions

SHOW EFFECTIVE PERMISSIONS FOR <name> [ON <kind>:<name>].

Fields

user: PolicyUserRef

resource: Option<PolicyResourceRef>

SimulatePolicy

SIMULATE <name> ACTION <verb> ON <kind>:<name>.

Fields

user: PolicyUserRef

action: String

resource: PolicyResourceRef

Implementations

impl QueryExpr

pub fn table(name: &str) -> TableQueryBuilder

Create a table query

pub fn graph() -> GraphQueryBuilder

Create a graph query

pub fn path(from: NodeSelector, to: NodeSelector) -> PathQueryBuilder

Create a path query

Trait Implementations

impl Clone for QueryExpr

fn clone(&self) -> QueryExpr

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for QueryExpr

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.