try implement context

src/main/scala/minisql/ast/Ast.scala

@@ -385,8 +385,9 @@ case class ScalarValueLift(
 
 case class ScalarQueryLift(
   name: String,
-  liftId: String
+  liftId: String,
-) extends ScalarLift {}
+  value: Option[(Seq[Any], ParamEncoder[?])]
+) extends ScalarLift
 
 object ScalarLift {
   given ToExpr[ScalarLift] with {

src/main/scala/minisql/context/Context.scala

@@ -4,9 +4,10 @@ import scala.deriving.*
 import scala.compiletime.*
 import scala.util.Try
 import minisql.util.*
-import minisql.idiom.{Idiom, Statement}
+import minisql.idiom.{Idiom, Statement, ReifyStatement}
 import minisql.{NamingStrategy, ParamEncoder}
 import minisql.ColumnDecoder
+import minisql.ast.{Ast, ScalarValueLift, CollectAst}
 
 trait Context[I <: Idiom, N <: NamingStrategy] { selft =>
 
@@ -50,21 +51,40 @@ trait Context[I <: Idiom, N <: NamingStrategy] { selft =>
 
   type Decoder[X] = ColumnDecoder.Aux[DBRow, X]
 
-  type DBIO[X] = (
+  type DBIO[E] = (
-    statement: Statement,
+    sql: String,
-    params: (Any, Encoder[?]),
+    params: List[(Any, Encoder[?])],
-    extract: RowExtract[X]
+    mapper: Iterable[DBRow] => Try[E]
   )
 
   extension (ast: Ast) {
-    extractParams
+    private def liftMap = {
+      val lifts = CollectAst.byType[ScalarValueLift](ast)
+      lifts.map(l => l.liftId -> l.value.get).toMap
+    }
+  }
+
+  extension (stmt: Statement) {
+    def expand(liftMap: Map[String, (Any, ParamEncoder[?])]) =
+      ReifyStatement(
+        idiom.liftingPlaceholder,
+        idiom.emptySetContainsToken,
+        stmt,
+        liftMap
+      )
   }
 
   inline def io[E](
     inline q: minisql.Query[E]
-  )(using r: RowExtract[E]): DBIO[Seq[E]] = {
+  )(using r: RowExtract[E]): DBIO[IArray[E]] = {
-    val statement = minisql.compile(q, idiom, naming)
+    val lifts         = q.liftMap
-    ???
+    val stmt          = minisql.compile(q, idiom, naming)
+    val (sql, params) = stmt.expand(lifts)
+    (
+      sql = sql,
+      params = params.map(_.value.get.asInstanceOf),
+      mapper = (rows) => rows.traverse(r.extract)
+    )
   }
 
 }

src/main/scala/minisql/idiom/ReifyStatement.scala

@@ -1,8 +1,9 @@
 package minisql.idiom
 
-import minisql.ast._
+import minisql.ParamEncoder
+import minisql.ast.*
 import minisql.util.Interleave
-import minisql.idiom.StatementInterpolator._
+import minisql.idiom.StatementInterpolator.*
 import scala.annotation.tailrec
 import scala.collection.immutable.{Map => SMap}
 
@@ -12,7 +13,7 @@ object ReifyStatement {
     liftingPlaceholder: Int => String,
     emptySetContainsToken: Token => Token,
     statement: Statement,
-    liftMap: SMap[String, (Any, Any)]
+    liftMap: SMap[String, (Any, ParamEncoder[?])]
   ): (String, List[ScalarValueLift]) = {
     val expanded = expandLiftings(statement, emptySetContainsToken, liftMap)
     token2string(expanded, liftingPlaceholder)
@@ -61,8 +62,39 @@ object ReifyStatement {
   private def expandLiftings(
     statement: Statement,
     emptySetContainsToken: Token => Token,
-    liftMap: SMap[String, (Any, Any)]
+    liftMap: SMap[String, (Any, ParamEncoder[?])]
-  ): Token = {
+  ): (Token) = {
-    ???
+    Statement {
+      val lb = List.newBuilder[Token]
+      statement.tokens.foldLeft(lb) {
+        case (
+              tokens,
+              SetContainsToken(a, op, ScalarLiftToken(lift: ScalarQueryLift))
+            ) =>
+          val (lv, le) = liftMap(lift.liftId)
+          lv.asInstanceOf[Iterable[Any]].toVector match {
+            case Vector() => tokens += emptySetContainsToken(a)
+            case values =>
+              val liftings = values.zipWithIndex.map {
+                case (v, i) =>
+                  ScalarLiftToken(
+                    ScalarValueLift(
+                      s"${lift.name}[${i}]",
+                      s"${lift.liftId}[${i}]",
+                      Some(v -> le)
+                    )
+                  )
+              }
+              val separators = Vector.fill(liftings.size - 1)(StringToken(", "))
+              (tokens += stmt"$a $op (") ++= Interleave(
+                liftings,
+                separators
+              ) += StringToken(")")
+          }
+        case (tokens, token) =>
+          tokens += token
+      }
+      lb.result()
+    }
   }
 }

src/main/scala/minisql/util/CollectTry.scala

@@ -2,7 +2,7 @@ package minisql.util
 
 import scala.util.*
 
-extension [A](xs: IArray[A]) {
+extension [A](xs: Iterable[A]) {
   private[minisql] def traverse[B](f: A => Try[B]): Try[IArray[B]] = {
     val out                     = IArray.newBuilder[Any]
     var left: Option[Throwable] = None