diff --git a/src/Expr.cc b/src/Expr.cc
index 68933eb228..1a7c06020a 100644
--- a/src/Expr.cc
+++ b/src/Expr.cc
@@ -4215,6 +4215,10 @@ TableCoerceExpr::TableCoerceExpr(ExprPtr arg_op, TableTypePtr tt, bool type_chec
 			SetError();
 			return;
 			}
+
+		if ( op->Tag() == EXPR_TABLE_COERCE && op->GetType() == tt )
+			// Avoid double-coercion.
+			op = op->GetOp1();
 		}
 
 	SetType(std::move(tt));
diff --git a/testing/btest/Baseline/plugins.hooks/output b/testing/btest/Baseline/plugins.hooks/output
index 998f804f04..33b1951ae4 100644
--- a/testing/btest/Baseline/plugins.hooks/output
+++ b/testing/btest/Baseline/plugins.hooks/output
@@ -735,7 +735,7 @@
 0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::STD_DEV, lambda_<5704045257244168718>{ SumStats::calc_std_dev(SumStats::rv)})) -> <no result>
 0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::SUM, lambda_<7459411543525688824>{ SumStats::rv$sum = SumStats::rv$sum + SumStats::val})) -> <no result>
 0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::TOPK, lambda_<6366101205573988923>{ topk_add(SumStats::rv$topk, to_any_coerceSumStats::obs)})) -> <no result>
-0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::UNIQUE, lambda_<6609886180724383051>{ if (!SumStats::rv?$unique_vals) SumStats::rv$unique_vals = (coerce (coerce set() to set[SumStats::Observation]) to set[SumStats::Observation])if (SumStats::r?$unique_max) SumStats::rv$unique_max = SumStats::r$unique_maxif (!SumStats::r?$unique_max || sizeofSumStats::rv$unique_vals <= SumStats::r$unique_max) add SumStats::rv$unique_vals[SumStats::obs]SumStats::rv$unique = sizeofSumStats::rv$unique_vals})) -> <no result>
+0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::UNIQUE, lambda_<11310474105220719698>{ if (!SumStats::rv?$unique_vals) SumStats::rv$unique_vals = (coerce set() to set[SumStats::Observation])if (SumStats::r?$unique_max) SumStats::rv$unique_max = SumStats::r$unique_maxif (!SumStats::r?$unique_max || sizeofSumStats::rv$unique_vals <= SumStats::r$unique_max) add SumStats::rv$unique_vals[SumStats::obs]SumStats::rv$unique = sizeofSumStats::rv$unique_vals})) -> <no result>
 0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::VARIANCE, lambda_<5978956599776442208>{ if (1 < SumStats::rv$num) SumStats::rv$var_s = SumStats::rv$var_s + ((SumStats::val - SumStats::rv$prev_avg) * (SumStats::val - SumStats::rv$average))SumStats::calc_variance(SumStats::rv)SumStats::rv$prev_avg = SumStats::rv$average})) -> <no result>
 0.000000   MetaHookPost  CallFunction(SumStats::register_observe_plugins, <frame>, ()) -> <no result>
 0.000000   MetaHookPost  CallFunction(Supervisor::__is_supervisor, <frame>, ()) -> <no result>
@@ -2313,7 +2313,7 @@
 0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::STD_DEV, lambda_<5704045257244168718>{ SumStats::calc_std_dev(SumStats::rv)}))
 0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::SUM, lambda_<7459411543525688824>{ SumStats::rv$sum = SumStats::rv$sum + SumStats::val}))
 0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::TOPK, lambda_<6366101205573988923>{ topk_add(SumStats::rv$topk, to_any_coerceSumStats::obs)}))
-0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::UNIQUE, lambda_<6609886180724383051>{ if (!SumStats::rv?$unique_vals) SumStats::rv$unique_vals = (coerce (coerce set() to set[SumStats::Observation]) to set[SumStats::Observation])if (SumStats::r?$unique_max) SumStats::rv$unique_max = SumStats::r$unique_maxif (!SumStats::r?$unique_max || sizeofSumStats::rv$unique_vals <= SumStats::r$unique_max) add SumStats::rv$unique_vals[SumStats::obs]SumStats::rv$unique = sizeofSumStats::rv$unique_vals}))
+0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::UNIQUE, lambda_<11310474105220719698>{ if (!SumStats::rv?$unique_vals) SumStats::rv$unique_vals = (coerce set() to set[SumStats::Observation])if (SumStats::r?$unique_max) SumStats::rv$unique_max = SumStats::r$unique_maxif (!SumStats::r?$unique_max || sizeofSumStats::rv$unique_vals <= SumStats::r$unique_max) add SumStats::rv$unique_vals[SumStats::obs]SumStats::rv$unique = sizeofSumStats::rv$unique_vals}))
 0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugin, <frame>, (SumStats::VARIANCE, lambda_<5978956599776442208>{ if (1 < SumStats::rv$num) SumStats::rv$var_s = SumStats::rv$var_s + ((SumStats::val - SumStats::rv$prev_avg) * (SumStats::val - SumStats::rv$average))SumStats::calc_variance(SumStats::rv)SumStats::rv$prev_avg = SumStats::rv$average}))
 0.000000   MetaHookPre   CallFunction(SumStats::register_observe_plugins, <frame>, ())
 0.000000   MetaHookPre   CallFunction(Supervisor::__is_supervisor, <frame>, ())
@@ -3890,7 +3890,7 @@
 0.000000 | HookCallFunction SumStats::register_observe_plugin(SumStats::STD_DEV, lambda_<5704045257244168718>{ SumStats::calc_std_dev(SumStats::rv)})
 0.000000 | HookCallFunction SumStats::register_observe_plugin(SumStats::SUM, lambda_<7459411543525688824>{ SumStats::rv$sum = SumStats::rv$sum + SumStats::val})
 0.000000 | HookCallFunction SumStats::register_observe_plugin(SumStats::TOPK, lambda_<6366101205573988923>{ topk_add(SumStats::rv$topk, to_any_coerceSumStats::obs)})
-0.000000 | HookCallFunction SumStats::register_observe_plugin(SumStats::UNIQUE, lambda_<6609886180724383051>{ if (!SumStats::rv?$unique_vals) SumStats::rv$unique_vals = (coerce (coerce set() to set[SumStats::Observation]) to set[SumStats::Observation])if (SumStats::r?$unique_max) SumStats::rv$unique_max = SumStats::r$unique_maxif (!SumStats::r?$unique_max || sizeofSumStats::rv$unique_vals <= SumStats::r$unique_max) add SumStats::rv$unique_vals[SumStats::obs]SumStats::rv$unique = sizeofSumStats::rv$unique_vals})
+0.000000 | HookCallFunction SumStats::register_observe_plugin(SumStats::UNIQUE, lambda_<11310474105220719698>{ if (!SumStats::rv?$unique_vals) SumStats::rv$unique_vals = (coerce set() to set[SumStats::Observation])if (SumStats::r?$unique_max) SumStats::rv$unique_max = SumStats::r$unique_maxif (!SumStats::r?$unique_max || sizeofSumStats::rv$unique_vals <= SumStats::r$unique_max) add SumStats::rv$unique_vals[SumStats::obs]SumStats::rv$unique = sizeofSumStats::rv$unique_vals})
 0.000000 | HookCallFunction SumStats::register_observe_plugin(SumStats::VARIANCE, lambda_<5978956599776442208>{ if (1 < SumStats::rv$num) SumStats::rv$var_s = SumStats::rv$var_s + ((SumStats::val - SumStats::rv$prev_avg) * (SumStats::val - SumStats::rv$average))SumStats::calc_variance(SumStats::rv)SumStats::rv$prev_avg = SumStats::rv$average})
 0.000000 | HookCallFunction SumStats::register_observe_plugins()
 0.000000 | HookCallFunction Supervisor::__is_supervisor()