diff --git a/partiql-ast/src/main/kotlin/org/partiql/ast/helpers/ToLegacyAst.kt b/partiql-ast/src/main/kotlin/org/partiql/ast/helpers/ToLegacyAst.kt
index fd7fdb2a90..2549ea6d5c 100644
--- a/partiql-ast/src/main/kotlin/org/partiql/ast/helpers/ToLegacyAst.kt
+++ b/partiql-ast/src/main/kotlin/org/partiql/ast/helpers/ToLegacyAst.kt
@@ -74,6 +74,8 @@ private class Ctx
 private class AstTranslator(val metas: Map<String, MetaContainer>) : AstBaseVisitor<PartiqlAst.PartiqlAstNode, Ctx>() {
 
     private val pig = PartiqlAst.BUILDER()
+    // Currently hard-coded in legacy code
+    private val aggregates = setOf("count", "avg", "sum", "min", "max", "any", "some", "every")
 
     override fun defaultReturn(node: AstNode, ctx: Ctx): Nothing {
         val fromClass = node::class.qualifiedName
@@ -331,7 +333,7 @@ private class AstTranslator(val metas: Map<String, MetaContainer>) : AstBaseVisi
     private fun String.isAggregateCall(): Boolean {
         // like PartiQLPigVisitor, keep legacy behavior the same as before
         // since it is legacy, hard-coded aggregation logic
-        return listOf("count", "avg", "sum", "min", "max", "any", "some", "every").contains(this)
+        return aggregates.contains(this)
     }
 
     override fun visitExprUnary(node: Expr.Unary, ctx: Ctx) = translate(node) { metas ->
diff --git a/partiql-planner/src/main/kotlin/org/partiql/planner/internal/transforms/RelConverter.kt b/partiql-planner/src/main/kotlin/org/partiql/planner/internal/transforms/RelConverter.kt
index f45fef89ca..5d82f4acbc 100644
--- a/partiql-planner/src/main/kotlin/org/partiql/planner/internal/transforms/RelConverter.kt
+++ b/partiql-planner/src/main/kotlin/org/partiql/planner/internal/transforms/RelConverter.kt
@@ -592,6 +592,9 @@ internal object RelConverter {
      * Rewrites a SELECT node replacing (and extracting) each aggregation `i` with a synthetic field name `$agg_i`.
      */
     private object AggregationTransform : AstRewriter<AggregationTransform.Context>() {
+        // currently hard-coded
+        @JvmStatic
+        private val aggregates = setOf("count", "avg", "sum", "min", "max", "any", "some", "every")
 
         private data class Context(
             val aggregations: MutableList<Expr.Call>,
@@ -634,8 +637,7 @@ internal object RelConverter {
         }
 
         private fun String.isAggregateCall(): Boolean {
-            // currently hard-coded
-            return listOf("count", "avg", "sum", "min", "max", "any", "some", "every").contains(this)
+            return aggregates.contains(this)
         }
 
         private fun Identifier.isAggregateCall(): Boolean {