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ViewManager.scala
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ViewManager.scala
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package mimir.views
import java.sql.SQLException
import sparsity.Name
import mimir._
import mimir.algebra._
import mimir.provenance._
import mimir.ctables._
import mimir.exec._
import mimir.exec.mode._
import mimir.serialization._
import com.typesafe.scalalogging.LazyLogging
import mimir.metadata._
import mimir.data.ViewSchemaProvider
class ViewManager(db:Database)
extends ViewSchemaProvider
with LazyLogging
{
var viewTable: MetadataMap = null
/**
* Initialize the view manager:
* - Create a system catalog table to store information about views
*/
def init(): Unit =
{
viewTable = db.metadata.registerMap(ID("MIMIR_VIEWS"), Seq(InitMap(Seq(
ID("QUERY") -> TString(),
ID("METADATA") -> TInt()
)
)))
}
/**
* Instantiate a new view
* @param name The name of the view to create
* @param query The query to back the view with
* @param force Force creation even if a table already exists
* @throws SQLException If a view or table with the same name already exists
*/
def create(name: ID, query: Operator, force: Boolean = false): Unit =
{
logger.debug(s"CREATE VIEW $name AS $query")
if(!force && db.catalog.tableExists(name)){
throw new SQLException(s"View '$name' already exists")
}
viewTable.put(name, Seq(
StringPrimitive(Json.ofOperator(query).toString),
IntPrimitive(0)
))
// updateMaterialization(name)
}
/**
* Alter an existing view to use a new query
* @param name The name of the view to alter
* @param query The new query to back the view with
* @throws SQLException If a view or table with the same name already exists
*/
def alter(name: ID, query: Operator): Unit =
{
val properties = apply(name)
viewTable.update(name, Map(
ID("QUERY") -> StringPrimitive(Json.ofOperator(query).toString)
))
if(properties.isMaterialized){
materialize(name)
}
}
/**
* Drop an existing view
* @param name The name of the view to alter
* @throws SQLException If a view or table with the same name already exists
*/
def drop(name: ID, ifExists: Boolean = false): Unit =
{
val properties =
get(name) match {
case Some(properties) => properties
case None => if(ifExists){ return }
else { throw new SQLException(s"Unknown View '$name'") }
}
viewTable.rm(name)
if(properties.isMaterialized){
db.catalog.materializedTableProvider().dropStoredTable(properties.materializedName)
}
}
/**
* Obtain the properties of the specified view
* @param name The name of the view to look up
* @return Properties for the specified query or None if the view doesn't exist
*/
def get(name: Name): Option[ViewMetadata] = get(ID.upper(name))
def get(name: ID): Option[ViewMetadata] =
{
val results =
logger.trace(s"Getting View $name")
viewTable.get(name).map(_._2.toSeq).map(
{
case Seq(StringPrimitive(s), IntPrimitive(meta)) => {
val query = Json.toOperator(Json.parse(s))
val isMaterialized =
meta != 0
new ViewMetadata(name, query, isMaterialized, db)
}
}
)
}
/**
* Obtain properties for the specified view
* @param name The name of the view to look up
* @return Properties for the specified query
* @throws SQLException If the specified view does not exist
*/
def apply(name: Name): ViewMetadata = apply(ID.upper(name))
def apply(name: ID): ViewMetadata =
{
get(name) match {
case None =>
throw new SQLException(s"Unknown View '$name'")
case Some(properties) =>
properties
}
}
/**
* Materialize the specified view
* @param name The name of the view to materialize
*/
def materialize(name: ID): Unit =
{
val properties = apply(name)
val bulkStorage = db.catalog.materializedTableProvider()
if(bulkStorage.tableExists(properties.materializedName)){
throw new SQLException(s"View '$name' is already materialized")
}
val (
query,
baseSchema,
columnTaint,
rowTaint,
provenance
) = BestGuess.rewriteRaw(db, properties.query)
val columns:Seq[ID] = baseSchema.map(_._1)
logger.debug(s"SCHEMA: $columns; $rowTaint; $columnTaint; $provenance")
val completeQuery =
Project(
columns.map { col => ProjectArg(col, Var(col)) } ++
Seq(
ProjectArg(
ViewAnnotation.taintBitVectorColumn,
ExpressionUtils.boolsToBitVector(
Seq(rowTaint)++columns.map { col => columnTaint(col) }
)
)
)++
(provenance.toSet -- columns.toSet).map { col => ProjectArg(col, Var(col)) },
query
)
logger.debug(s"RAW: $completeQuery")
logger.debug(s"MATERIALIZE: $name(${completeQuery.columnNames.mkString(",")})")
bulkStorage.createStoredTableAs(completeQuery, properties.materializedName, db)
viewTable.update(name, Map(ID("METADATA") -> IntPrimitive(1)))
}
/**
* Remove the materialization for the specified view
* @param name The name of the view to dematerialize
*/
def dematerialize(name: ID): Unit = {
val metadata = apply(name)
if(metadata.isMaterialized){
db.catalog.materializedTableProvider().dropStoredTable(metadata.materializedName)
viewTable.update(name, Map(ID("METADATA") -> IntPrimitive(0)))
} else {
throw new SQLException(s"$name is already materialized")
}
}
/**
* List all views known to the view manager
* @return A list of all view names
*/
def list(): Seq[ID] =
viewTable.keys
/**
* Return a query that can be used to list all views known to Mimir.
* Used mainly by Mimir's system catalog
* @return A query that returns a list of all known views when executed
*/
def listViewsQuery: Operator =
{
HardTable(
Seq( ID("TABLE_NAME") -> TString() ),
list.map { col => StringPrimitive(col.id) }.map { Seq(_) }
)
}
/**
* Return a query that can be used to list the attributes of all views known to Mimir.
* Used mainly by Mimir's system catalog
* (presently unimplemented)
*/
def listAttrsQuery: Operator =
{
logger.warn("Constructing lens attribute list not implemented yet")
HardTable(Seq(
ID("TABLE_NAME") -> TString(),
ID("ATTR_NAME") -> TString(),
ID("ATTR_TYPE") -> TString(),
ID("IS_KEY") -> TBool()
),
list().flatMap { view =>
db.typechecker.schemaOf(get(view).get.query).map { case (col, t) =>
Seq(
StringPrimitive(view.id),
StringPrimitive(col.id),
TypePrimitive(t),
BoolPrimitive(false)
)
}
}
)
}
/**
* Rebuild Adaptive Views: The first step in query rewriting.
*
* For each adaptive view in the provided query, rerun viewFor so we get
* an updated view in case of hard-coded model use in the view creation
* and subsequent feedback.
* @param op The operator to rebuild adaptive views in
* @return A version of the tree for `op` with refreshed View nodes.
*/
def rebuildAdaptiveViews(op:Operator): Operator = op match {
case AdaptiveView(schema, name, oper, anno) => db.adaptiveSchemas.viewFor(schema, name).get
case _ => op.recur(rebuildAdaptiveViews(_))
}
/**
* Resolve views: The final step in query rewriting.
*
* For each view in the provided query, decide whether the view can be resolved to
* a materialized view table, or whether it needs to be executed directly.
* @param op The operator to resolve views in
* @return A version of the tree for `op` with no View nodes.
*/
def resolve(op: Operator): Operator =
{
op match {
case View(name, query, wantAnnotations) => {
val metadata = apply(name)
if(!metadata.isMaterialized){
logger.debug(s"Not using materialized view: '$name' is not materialized")
return resolve(query)
}
val haveAnnotations = Set(
ViewAnnotation.BEST_GUESS,
ViewAnnotation.TAINT,
ViewAnnotation.PROVENANCE
)
val missingAnnotations = wantAnnotations -- haveAnnotations
if(!missingAnnotations.isEmpty) {
logger.debug(s"Not using materialized view: Missing { ${missingAnnotations.mkString(", ")} } from '$name'")
return resolve(query)
}
logger.debug(s"Using materialized view: Materialized '$name' with { ${wantAnnotations.mkString(", ")} } <- ${metadata.materializedName}")
Project(
metadata.schemaWith(wantAnnotations).map { col =>
ProjectArg(col._1, Var(col._1))
},
materializedTableOperator(metadata)
)
}
case AdaptiveView(schema, name, query, wantAnnotations) => {
return resolve(query)
}
case _ =>
op.recur(resolve(_))
}
}
def listTables() = list()
def tableSchema(table: ID) =
get(table).map { view => db.typechecker.schemaOf(view.query) }
def view(table: ID) = apply(table).operator
def materializedTableOperator(table: ID): Operator =
materializedTableOperator(apply(table:ID))
def materializedTableOperator(metadata: ViewMetadata): Operator =
{
// retain the base columns
var projectedColumns =
metadata.schema.map { case (col, _) => ProjectArg(col, Var(col)) }
// if we want the taint columns, decode them
if(metadata.annotations(ViewAnnotation.TAINT)){
projectedColumns ++=
metadata.schemaWith(Set(ViewAnnotation.PROVENANCE)).zipWithIndex.map { case ((col, _), idx) =>
ProjectArg(
OperatorDeterminism.mimirColDeterministicColumn(col),
Comparison(Cmp.Eq,
Arithmetic(Arith.BitAnd,
Var(ViewAnnotation.taintBitVectorColumn),
IntPrimitive(1l << (idx+1))
),
IntPrimitive(1l << (idx+1))
)
)
} :+
ProjectArg(
OperatorDeterminism.mimirRowDeterministicColumnName,
Comparison(Cmp.Eq,
Arithmetic(Arith.BitAnd,
Var(ViewAnnotation.taintBitVectorColumn),
IntPrimitive(1l)
),
IntPrimitive(1l)
)
)
}
if(metadata.annotations(ViewAnnotation.PROVENANCE)){
projectedColumns ++=
metadata.provenanceCols.map { col => ProjectArg(col, Var(col)) }
}
return Project(projectedColumns, metadata.materializedOperator)
}
}
object ViewManager
{
val SCHEMA = ID("VIEW")
val MATERIALIZED_VIEW_SCHEMA = ID("MATERIALIZED_VIEW")
}