307 lines
13 KiB
Haskell
307 lines
13 KiB
Haskell
module Ringo.Generator
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( tableDefnSQL
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, factTableDefnSQL
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, dimensionTablePopulateSQL
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, factTablePopulateSQL
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) where
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import qualified Data.Text as Text
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#if MIN_VERSION_base(4,8,0)
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#else
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import Control.Applicative ((<$>))
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#endif
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import Control.Monad.Reader (Reader, asks)
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import Data.List (nub, find)
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import Data.Maybe (fromJust, fromMaybe, mapMaybe)
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import Data.Monoid ((<>))
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import Data.Text (Text)
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import Ringo.Extractor.Internal
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import Ringo.Types
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import Ringo.Utils
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nullableDefnSQL :: Nullable -> Text
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nullableDefnSQL Null = "NULL"
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nullableDefnSQL NotNull = "NOT NULL"
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columnDefnSQL :: Column -> Text
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columnDefnSQL Column {..} =
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columnName <> " " <> columnType <> " " <> nullableDefnSQL columnNullable
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joinColumnNames :: [ColumnName] -> Text
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joinColumnNames = Text.intercalate ",\n"
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fullColName :: TableName -> ColumnName -> ColumnName
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fullColName tName cName = tName <> "." <> cName
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constraintDefnSQL :: Table -> TableConstraint -> [Text]
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constraintDefnSQL Table {..} constraint =
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let alterTableSQL = "ALTER TABLE ONLY " <> tableName <> " ADD "
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in case constraint of
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PrimaryKey cName -> [ alterTableSQL <> "PRIMARY KEY (" <> cName <> ")" ]
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ForeignKey oTableName cNamePairs ->
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[ alterTableSQL <> "FOREIGN KEY (" <> joinColumnNames (map fst cNamePairs) <> ") REFERENCES "
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<> oTableName <> " (" <> joinColumnNames (map snd cNamePairs) <> ")" ]
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UniqueKey cNames -> ["CREATE UNIQUE INDEX ON " <> tableName <> " (" <> joinColumnNames cNames <> ")"]
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tableDefnSQL :: Table -> [Text]
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tableDefnSQL table@Table {..} =
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tableSQL : concatMap (constraintDefnSQL table) tableConstraints
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where
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tableSQL = "CREATE TABLE " <> tableName <> " (\n"
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<> (joinColumnNames . map columnDefnSQL $ tableColumns)
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<> "\n)"
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factTableDefnSQL :: Fact -> Table -> Reader Env [Text]
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factTableDefnSQL fact table = do
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Settings {..} <- asks envSettings
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allDims <- extractAllDimensionTables fact
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let factCols = forMaybe (factColumns fact) $ \col -> case col of
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DimTime cName -> Just $ timeUnitColumnName settingDimTableIdColumnName cName settingTimeUnit
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NoDimId cName -> Just cName
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_ -> Nothing
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dimCols = [ factDimFKIdColumnName settingDimPrefix settingDimTableIdColumnName tableName
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| (_, Table {..}) <- allDims ]
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indexSQLs = [ "CREATE INDEX ON " <> tableName table <> " USING btree (" <> col <> ")"
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| col <- factCols ++ dimCols ]
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return $ tableDefnSQL table ++ indexSQLs
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dimColumnMapping :: Text -> Fact -> TableName -> [(ColumnName, ColumnName)]
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dimColumnMapping dimPrefix fact dimTableName =
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[ (dimColumnName dName cName, cName)
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| DimVal dName cName <- factColumns fact , dimPrefix <> dName == dimTableName]
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coalesceColumn :: TableName -> Column -> Text
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coalesceColumn tName Column{..} =
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if columnNullable == Null
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then "coalesce(" <> fqColName <> "," <> defVal columnType <> ")"
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else fqColName
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where
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fqColName = fullColName tName columnName
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defVal colType
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| "integer" `Text.isPrefixOf` colType = "-42"
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| "timestamp" `Text.isPrefixOf` colType = "'00-00-00 00:00:00'"
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| "character" `Text.isPrefixOf` colType = "'XXX_UNKNOWN_'"
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| "uuid" `Text.isPrefixOf` colType = "'00000000-0000-0000-0000-000000000000'::uuid"
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| "boolean" `Text.isPrefixOf` colType = "false"
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| otherwise = error $ "Unknown column type: " ++ Text.unpack colType
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dimensionTablePopulateSQL :: TablePopulationMode -> Fact -> TableName -> Reader Env Text
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dimensionTablePopulateSQL popMode fact dimTableName = do
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dimPrefix <- settingDimPrefix <$> asks envSettings
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tables <- asks envTables
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let factTable = fromJust $ findTable (factTableName fact) tables
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colMapping = dimColumnMapping dimPrefix fact dimTableName
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baseSelectC = "SELECT DISTINCT\n"
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<> joinColumnNames
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(map (\(_, c) ->
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let col = fromJust . findColumn c $ tableColumns factTable
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in coalesceColumn (factTableName fact) col)
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colMapping)
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<> "\n"
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<> "FROM " <> factTableName fact
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insertC selectC = "INSERT INTO " <> dimTableName
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<> " (\n" <> joinColumnNames (map fst colMapping) <> "\n) "
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<> "SELECT x.* FROM (\n" <> selectC <> ") x"
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timeCol = head [ cName | DimTime cName <- factColumns fact ]
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return $ case popMode of
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FullPopulation -> insertC baseSelectC
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IncrementalPopulation ->
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insertC (baseSelectC <> "\nWHERE "
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<> timeCol <> " > ? AND " <> timeCol <> " <= ?"
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<> " AND (\n"
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<> Text.intercalate "\nOR " [ c <> " IS NOT NULL" | (_, c) <- colMapping ]
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<> "\n)")
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<> "\nLEFT JOIN " <> dimTableName <> " ON\n"
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<> Text.intercalate " \nAND "
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[ fullColName dimTableName c1 <> " IS NOT DISTINCT FROM " <> fullColName "x" c2
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| (c1, c2) <- colMapping ]
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<> "\nWHERE " <> Text.intercalate " \nAND "
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[ fullColName dimTableName c <> " IS NULL" | (c, _) <- colMapping ]
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data FactTablePopulateSelectSQL = FactTablePopulateSelectSQL
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{ ftpsSelectCols :: ![(Text, Text)]
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, ftpsSelectTable :: !Text
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, ftpsJoinClauses :: ![Text]
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, ftpsWhereClauses :: ![Text]
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, ftpsGroupByCols :: ![Text]
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} deriving (Show, Eq)
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factTablePopulateSQL :: TablePopulationMode -> Fact -> Reader Env [Text]
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factTablePopulateSQL popMode fact = do
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Settings {..} <- asks envSettings
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allDims <- extractAllDimensionTables fact
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tables <- asks envTables
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let fTableName = factTableName fact
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fTable = fromJust . findTable fTableName $ tables
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dimIdColName = settingDimTableIdColumnName
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tablePKColName = head [ cName | PrimaryKey cName <- tableConstraints fTable ]
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timeUnitColumnInsertSQL cName =
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let colName = timeUnitColumnName dimIdColName cName settingTimeUnit
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in ( colName
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, "extract(epoch from " <> fullColName fTableName cName <> ")::bigint/"
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<> Text.pack (show $ timeUnitToSeconds settingTimeUnit)
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, True
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)
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factColMap = concatFor (factColumns fact) $ \col -> case col of
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DimTime cName -> [ timeUnitColumnInsertSQL cName ]
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NoDimId cName ->
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let sCol = fromJust . findColumn cName $ tableColumns fTable
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in [ (cName, coalesceColumn fTableName sCol, True) ]
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FactCount scName cName ->
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[ (cName, "count(" <> maybe "*" (fullColName fTableName) scName <> ")", False) ]
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FactSum scName cName ->
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[ (cName, "sum(" <> fullColName fTableName scName <> ")", False) ]
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FactAverage scName cName ->
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[ ( cName <> settingAvgCountColumSuffix
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, "count(" <> fullColName fTableName scName <> ")"
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, False
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)
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, ( cName <> settingAvgSumColumnSuffix
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, "sum(" <> fullColName fTableName scName <> ")"
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, False
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)
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]
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FactCountDistinct _ cName -> [ (cName, "'{}'::json", False)]
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_ -> []
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dimColMap = for allDims $ \(dimFact, factTable@Table {tableName}) ->
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let colName = factDimFKIdColumnName settingDimPrefix dimIdColName tableName
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col = fromJust . findColumn colName $ tableColumns factSourceTable
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factSourceTableName = factTableName dimFact
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factSourceTable = fromJust . findTable factSourceTableName $ tables
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insertSQL = if factTable `elem` tables -- existing dimension table
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then (if columnNullable col == Null then coalesceFKId else id)
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$ fullColName factSourceTableName colName
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else let
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dimLookupWhereClauses =
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[ fullColName tableName c1 <> " = " <> coalesceColumn factSourceTableName col2
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| (c1, c2) <- dimColumnMapping settingDimPrefix dimFact tableName
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, let col2 = fromJust . findColumn c2 $ tableColumns factSourceTable ]
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in "SELECT " <> dimIdColName <> " FROM " <> tableName <> "\nWHERE "
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<> Text.intercalate "\n AND " dimLookupWhereClauses
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insertSQL' = if factSourceTableName == fTableName
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then insertSQL
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else coalesceFKId insertSQL
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in (colName, insertSQL', True)
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colMap = [ (cName, (sql, groupByColPrefix <> cName), addAs)
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| (cName, sql, addAs) <- factColMap ++ dimColMap ]
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joinClauses =
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mapMaybe (\tName -> (\p -> "LEFT JOIN " <> tName <> "\nON "<> p) <$> joinClausePreds fTable tName)
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. nub
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. map (factTableName . fst)
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$ allDims
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timeCol = fullColName fTableName $ head [ cName | DimTime cName <- factColumns fact ]
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extFactTableName =
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extractedFactTableName settingFactPrefix settingFactInfix (factName fact) settingTimeUnit
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insertIntoSelectSQL =
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FactTablePopulateSelectSQL
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{ ftpsSelectCols = map snd3 colMap
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, ftpsSelectTable = fTableName
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, ftpsJoinClauses = joinClauses
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, ftpsWhereClauses = if popMode == IncrementalPopulation
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then [timeCol <> " > ?", timeCol <> " <= ?"]
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else []
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, ftpsGroupByCols = map ((groupByColPrefix <>) . fst3) . filter thd3 $ colMap
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}
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insertIntoInsertSQL = "INSERT INTO " <> extFactTableName
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<> " (\n" <> Text.intercalate ",\n " (map fst3 colMap) <> "\n)"
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countDistinctCols = [ col | col@(FactCountDistinct _ _) <- factColumns fact]
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updateSQLs =
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let origGroupByCols = ftpsGroupByCols insertIntoSelectSQL
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origSelectCols = ftpsSelectCols insertIntoSelectSQL
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in for countDistinctCols $ \(FactCountDistinct scName cName) ->
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let unqCol = fullColName fTableName (fromMaybe tablePKColName scName) <> "::text"
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bucketSelectCols =
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[ ( "hashtext(" <> unqCol <> ") & "
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<> Text.pack (show $ bucketCount settingFactCountDistinctErrorRate - 1)
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, cName <> "_bnum")
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, ( "31 - floor(log(2, min(hashtext(" <> unqCol <> ") & ~(1 << 31))))::int"
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, cName <> "_bhash"
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)
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]
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selectSQL = toSelectSQL $
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insertIntoSelectSQL
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{ ftpsSelectCols = filter ((`elem` origGroupByCols) . snd) origSelectCols ++ bucketSelectCols
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, ftpsGroupByCols = origGroupByCols ++ [cName <> "_bnum"]
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, ftpsWhereClauses = ftpsWhereClauses insertIntoSelectSQL ++ [ unqCol <> " IS NOT NULL" ]
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}
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aggSelectClause =
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"json_object_agg(" <> cName <> "_bnum, " <> cName <> "_bhash) AS " <> cName
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in "UPDATE " <> extFactTableName
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<> "\nSET " <> cName <> " = " <> fullColName "xyz" cName
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<> "\nFROM ("
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<> "\nSELECT " <> joinColumnNames (origGroupByCols ++ [aggSelectClause])
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<> "\nFROM (\n" <> selectSQL <> "\n) zyx"
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<> "\nGROUP BY \n" <> joinColumnNames origGroupByCols
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<> "\n) xyz"
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<> "\n WHERE\n"
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<> Text.intercalate "\nAND "
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[ fullColName extFactTableName .fromJust . Text.stripPrefix groupByColPrefix $ col
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<> " = " <> fullColName "xyz" col
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| col <- origGroupByCols ]
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return $ insertIntoInsertSQL <> "\n" <> toSelectSQL insertIntoSelectSQL :
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if null countDistinctCols then [] else updateSQLs
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where
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groupByColPrefix = "xxff_"
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joinClausePreds table oTableName =
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fmap (\(ForeignKey _ colPairs) ->
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Text.intercalate " AND "
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. map (\(c1, c2) -> fullColName (tableName table) c1 <> " = " <> fullColName oTableName c2)
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$ colPairs )
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. find (\cons -> case cons of
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ForeignKey tName _ -> tName == oTableName
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_ -> False)
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. tableConstraints
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$ table
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toSelectSQL FactTablePopulateSelectSQL {..} =
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"SELECT \n" <> joinColumnNames (map (uncurry asName) ftpsSelectCols)
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<> "\nFROM " <> ftpsSelectTable
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<> (if not . null $ ftpsJoinClauses
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then "\n" <> Text.intercalate "\n" ftpsJoinClauses
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else "")
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<> (if not . null $ ftpsWhereClauses
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then "\nWHERE " <> Text.intercalate "\nAND " ftpsWhereClauses
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else "")
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<> "\nGROUP BY \n"
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<> joinColumnNames ftpsGroupByCols
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where
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asName sql alias = "(" <> sql <> ")" <> " as " <> alias
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coalesceFKId col =
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if "coalesce" `Text.isPrefixOf` col
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then col
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else "coalesce((" <> col <> "), -1)"
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bucketCount :: Double -> Integer
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bucketCount errorRate =
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let power :: Double = fromIntegral (ceiling . logBase 2 $ (1.04 / errorRate) ** 2 :: Integer)
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in ceiling $ 2 ** power
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