diff --git a/crates/squawk_syntax/src/snapshots/squawk_syntax__test__in_array_expr_ok_validation.snap b/crates/squawk_syntax/src/snapshots/squawk_syntax__test__in_array_expr_ok_validation.snap
new file mode 100644
index 000000000..5f637f319
--- /dev/null
+++ b/crates/squawk_syntax/src/snapshots/squawk_syntax__test__in_array_expr_ok_validation.snap
@@ -0,0 +1,245 @@
+---
+source: crates/squawk_syntax/src/test.rs
+input_file: crates/squawk_syntax/test_data/validation/in_array_expr_ok.sql
+---
+SOURCE_FILE@0..363
+  SELECT@0..74
+    SELECT_CLAUSE@0..8
+      SELECT_KW@0..6 "SELECT"
+      WHITESPACE@6..7 " "
+      TARGET_LIST@7..8
+        TARGET@7..8
+          STAR@7..8 "*"
+    WHITESPACE@8..9 " "
+    FROM_CLAUSE@9..20
+      FROM_KW@9..13 "FROM"
+      WHITESPACE@13..14 " "
+      RELATION_FROM_ITEM@14..20
+        RELATION_NAME_REF@14..20
+          PATH_REF@14..20
+            PATH_SEGMENT_REF@14..20
+              IDENT@14..20 "recipe"
+    WHITESPACE@20..21 " "
+    WHERE_CLAUSE@21..73
+      WHERE_KW@21..26 "WHERE"
+      WHITESPACE@26..27 " "
+      BIN_EXPR@27..73
+        NAME_REF@27..30
+          IDENT@27..30 "tag"
+        WHITESPACE@30..31 " "
+        NOT_IN@31..37
+          NOT_KW@31..34 "NOT"
+          WHITESPACE@34..35 " "
+          IN_KW@35..37 "IN"
+        WHITESPACE@37..38 " "
+        TUPLE_EXPR@38..73
+          L_PAREN@38..39 "("
+          LITERAL@39..50
+            STRING@39..50 "'breakfast'"
+          COMMA@50..51 ","
+          WHITESPACE@51..52 " "
+          LITERAL@52..59
+            STRING@52..59 "'snack'"
+          COMMA@59..60 ","
+          WHITESPACE@60..61 " "
+          LITERAL@61..72
+            STRING@61..72 "'appetizer'"
+          R_PAREN@72..73 ")"
+    SEMICOLON@73..74 ";"
+  WHITESPACE@74..75 "\n"
+  SELECT@75..156
+    SELECT_CLAUSE@75..83
+      SELECT_KW@75..81 "SELECT"
+      WHITESPACE@81..82 " "
+      TARGET_LIST@82..83
+        TARGET@82..83
+          STAR@82..83 "*"
+    WHITESPACE@83..84 " "
+    FROM_CLAUSE@84..95
+      FROM_KW@84..88 "FROM"
+      WHITESPACE@88..89 " "
+      RELATION_FROM_ITEM@89..95
+        RELATION_NAME_REF@89..95
+          PATH_REF@89..95
+            PATH_SEGMENT_REF@89..95
+              IDENT@89..95 "recipe"
+    WHITESPACE@95..96 " "
+    WHERE_CLAUSE@96..155
+      WHERE_KW@96..101 "WHERE"
+      WHITESPACE@101..102 " "
+      BIN_EXPR@102..155
+        NAME_REF@102..105
+          IDENT@102..105 "tag"
+        WHITESPACE@105..106 " "
+        NEQB@106..108 "<>"
+        WHITESPACE@108..109 " "
+        CALL_EXPR@109..155
+          ALL_FN@109..155
+            ALL_KW@109..112 "ALL"
+            WHITESPACE@112..113 " "
+            L_PAREN@113..114 "("
+            ARRAY_EXPR@114..154
+              ARRAY_KW@114..119 "ARRAY"
+              L_BRACK@119..120 "["
+              LITERAL@120..131
+                STRING@120..131 "'breakfast'"
+              COMMA@131..132 ","
+              WHITESPACE@132..133 " "
+              LITERAL@133..140
+                STRING@133..140 "'snack'"
+              COMMA@140..141 ","
+              WHITESPACE@141..142 " "
+              LITERAL@142..153
+                STRING@142..153 "'appetizer'"
+              R_BRACK@153..154 "]"
+            R_PAREN@154..155 ")"
+    SEMICOLON@155..156 ";"
+  WHITESPACE@156..157 "\n"
+  SELECT@157..238
+    SELECT_CLAUSE@157..165
+      SELECT_KW@157..163 "SELECT"
+      WHITESPACE@163..164 " "
+      TARGET_LIST@164..165
+        TARGET@164..165
+          STAR@164..165 "*"
+    WHITESPACE@165..166 " "
+    FROM_CLAUSE@166..177
+      FROM_KW@166..170 "FROM"
+      WHITESPACE@170..171 " "
+      RELATION_FROM_ITEM@171..177
+        RELATION_NAME_REF@171..177
+          PATH_REF@171..177
+            PATH_SEGMENT_REF@171..177
+              IDENT@171..177 "recipe"
+    WHITESPACE@177..178 " "
+    WHERE_CLAUSE@178..237
+      WHERE_KW@178..183 "WHERE"
+      WHITESPACE@183..184 " "
+      PREFIX_EXPR@184..237
+        NOT_KW@184..187 "NOT"
+        WHITESPACE@187..188 " "
+        PAREN_EXPR@188..237
+          L_PAREN@188..189 "("
+          BIN_EXPR@189..236
+            NAME_REF@189..192
+              IDENT@189..192 "tag"
+            WHITESPACE@192..193 " "
+            CUSTOM_OP@193..195
+              AMP@193..194 "&"
+              AMP@194..195 "&"
+            WHITESPACE@195..196 " "
+            ARRAY_EXPR@196..236
+              ARRAY_KW@196..201 "ARRAY"
+              L_BRACK@201..202 "["
+              LITERAL@202..213
+                STRING@202..213 "'breakfast'"
+              COMMA@213..214 ","
+              WHITESPACE@214..215 " "
+              LITERAL@215..222
+                STRING@215..222 "'snack'"
+              COMMA@222..223 ","
+              WHITESPACE@223..224 " "
+              LITERAL@224..235
+                STRING@224..235 "'appetizer'"
+              R_BRACK@235..236 "]"
+          R_PAREN@236..237 ")"
+    SEMICOLON@237..238 ";"
+  WHITESPACE@238..239 "\n"
+  SELECT@239..269
+    SELECT_CLAUSE@239..268
+      SELECT_KW@239..245 "SELECT"
+      WHITESPACE@245..246 " "
+      TARGET_LIST@246..268
+        TARGET@246..268
+          BIN_EXPR@246..268
+            ARRAY_EXPR@246..254
+              ARRAY_KW@246..251 "ARRAY"
+              L_BRACK@251..252 "["
+              LITERAL@252..253
+                INT_NUMBER@252..253 "1"
+              R_BRACK@253..254 "]"
+            WHITESPACE@254..255 " "
+            IN_KW@255..257 "IN"
+            WHITESPACE@257..258 " "
+            PAREN_EXPR@258..268
+              L_PAREN@258..259 "("
+              ARRAY_EXPR@259..267
+                ARRAY_KW@259..264 "ARRAY"
+                L_BRACK@264..265 "["
+                LITERAL@265..266
+                  INT_NUMBER@265..266 "1"
+                R_BRACK@266..267 "]"
+              R_PAREN@267..268 ")"
+    SEMICOLON@268..269 ";"
+  WHITESPACE@269..270 "\n"
+  SELECT@270..310
+    SELECT_CLAUSE@270..297
+      SELECT_KW@270..276 "SELECT"
+      WHITESPACE@276..277 " "
+      TARGET_LIST@277..297
+        TARGET@277..297
+          BIN_EXPR@277..297
+            NAME_REF@277..280
+              IDENT@277..280 "tag"
+            WHITESPACE@280..281 " "
+            IN_KW@281..283 "IN"
+            WHITESPACE@283..284 " "
+            PAREN_EXPR@284..297
+              L_PAREN@284..285 "("
+              LITERAL@285..296
+                STRING@285..296 "'breakfast'"
+              R_PAREN@296..297 ")"
+    WHITESPACE@297..298 " "
+    FROM_CLAUSE@298..309
+      FROM_KW@298..302 "FROM"
+      WHITESPACE@302..303 " "
+      RELATION_FROM_ITEM@303..309
+        RELATION_NAME_REF@303..309
+          PATH_REF@303..309
+            PATH_SEGMENT_REF@303..309
+              IDENT@303..309 "recipe"
+    SEMICOLON@309..310 ";"
+  WHITESPACE@310..311 "\n"
+  SELECT@311..362
+    SELECT_CLAUSE@311..349
+      SELECT_KW@311..317 "SELECT"
+      WHITESPACE@317..318 " "
+      TARGET_LIST@318..349
+        TARGET@318..349
+          BIN_EXPR@318..349
+            NAME_REF@318..321
+              IDENT@318..321 "tag"
+            WHITESPACE@321..322 " "
+            IN_KW@322..324 "IN"
+            WHITESPACE@324..325 " "
+            PAREN_EXPR@325..349
+              L_PAREN@325..326 "("
+              SELECT@326..348
+                SELECT_CLAUSE@326..336
+                  SELECT_KW@326..332 "SELECT"
+                  WHITESPACE@332..333 " "
+                  TARGET_LIST@333..336
+                    TARGET@333..336
+                      NAME_REF@333..336
+                        IDENT@333..336 "tag"
+                WHITESPACE@336..337 " "
+                FROM_CLAUSE@337..348
+                  FROM_KW@337..341 "FROM"
+                  WHITESPACE@341..342 " "
+                  RELATION_FROM_ITEM@342..348
+                    RELATION_NAME_REF@342..348
+                      PATH_REF@342..348
+                        PATH_SEGMENT_REF@342..348
+                          IDENT@342..348 "recipe"
+              R_PAREN@348..349 ")"
+    WHITESPACE@349..350 " "
+    FROM_CLAUSE@350..361
+      FROM_KW@350..354 "FROM"
+      WHITESPACE@354..355 " "
+      RELATION_FROM_ITEM@355..361
+        RELATION_NAME_REF@355..361
+          PATH_REF@355..361
+            PATH_SEGMENT_REF@355..361
+              IDENT@355..361 "recipe"
+    SEMICOLON@361..362 ";"
+  WHITESPACE@362..363 "\n"
diff --git a/crates/squawk_syntax/src/snapshots/squawk_syntax__test__in_array_expr_validation.snap b/crates/squawk_syntax/src/snapshots/squawk_syntax__test__in_array_expr_validation.snap
new file mode 100644
index 000000000..6a7baa1bf
--- /dev/null
+++ b/crates/squawk_syntax/src/snapshots/squawk_syntax__test__in_array_expr_validation.snap
@@ -0,0 +1,289 @@
+---
+source: crates/squawk_syntax/src/test.rs
+input_file: crates/squawk_syntax/test_data/validation/in_array_expr.sql
+---
+SOURCE_FILE@0..402
+  SELECT@0..75
+    SELECT_CLAUSE@0..8
+      SELECT_KW@0..6 "SELECT"
+      WHITESPACE@6..7 " "
+      TARGET_LIST@7..8
+        TARGET@7..8
+          STAR@7..8 "*"
+    WHITESPACE@8..9 " "
+    FROM_CLAUSE@9..20
+      FROM_KW@9..13 "FROM"
+      WHITESPACE@13..14 " "
+      RELATION_FROM_ITEM@14..20
+        RELATION_NAME_REF@14..20
+          PATH_REF@14..20
+            PATH_SEGMENT_REF@14..20
+              IDENT@14..20 "recipe"
+    WHITESPACE@20..21 " "
+    WHERE_CLAUSE@21..74
+      WHERE_KW@21..26 "WHERE"
+      WHITESPACE@26..27 " "
+      BIN_EXPR@27..74
+        NAME_REF@27..30
+          IDENT@27..30 "tag"
+        WHITESPACE@30..31 " "
+        IN_KW@31..33 "IN"
+        WHITESPACE@33..34 " "
+        ARRAY_EXPR@34..74
+          ARRAY_KW@34..39 "ARRAY"
+          L_BRACK@39..40 "["
+          LITERAL@40..51
+            STRING@40..51 "'breakfast'"
+          COMMA@51..52 ","
+          WHITESPACE@52..53 " "
+          LITERAL@53..60
+            STRING@53..60 "'snack'"
+          COMMA@60..61 ","
+          WHITESPACE@61..62 " "
+          LITERAL@62..73
+            STRING@62..73 "'appetizer'"
+          R_BRACK@73..74 "]"
+    SEMICOLON@74..75 ";"
+  WHITESPACE@75..76 "\n"
+  SELECT@76..155
+    SELECT_CLAUSE@76..84
+      SELECT_KW@76..82 "SELECT"
+      WHITESPACE@82..83 " "
+      TARGET_LIST@83..84
+        TARGET@83..84
+          STAR@83..84 "*"
+    WHITESPACE@84..85 " "
+    FROM_CLAUSE@85..96
+      FROM_KW@85..89 "FROM"
+      WHITESPACE@89..90 " "
+      RELATION_FROM_ITEM@90..96
+        RELATION_NAME_REF@90..96
+          PATH_REF@90..96
+            PATH_SEGMENT_REF@90..96
+              IDENT@90..96 "recipe"
+    WHITESPACE@96..97 " "
+    WHERE_CLAUSE@97..154
+      WHERE_KW@97..102 "WHERE"
+      WHITESPACE@102..103 " "
+      BIN_EXPR@103..154
+        NAME_REF@103..106
+          IDENT@103..106 "tag"
+        WHITESPACE@106..107 " "
+        NOT_IN@107..113
+          NOT_KW@107..110 "NOT"
+          WHITESPACE@110..111 " "
+          IN_KW@111..113 "IN"
+        WHITESPACE@113..114 " "
+        ARRAY_EXPR@114..154
+          ARRAY_KW@114..119 "ARRAY"
+          L_BRACK@119..120 "["
+          LITERAL@120..131
+            STRING@120..131 "'breakfast'"
+          COMMA@131..132 ","
+          WHITESPACE@132..133 " "
+          LITERAL@133..140
+            STRING@133..140 "'snack'"
+          COMMA@140..141 ","
+          WHITESPACE@141..142 " "
+          LITERAL@142..153
+            STRING@142..153 "'appetizer'"
+          R_BRACK@153..154 "]"
+    SEMICOLON@154..155 ";"
+  WHITESPACE@155..156 "\n"
+  SELECT@156..202
+    SELECT_CLAUSE@156..164
+      SELECT_KW@156..162 "SELECT"
+      WHITESPACE@162..163 " "
+      TARGET_LIST@163..164
+        TARGET@163..164
+          STAR@163..164 "*"
+    WHITESPACE@164..165 " "
+    FROM_CLAUSE@165..176
+      FROM_KW@165..169 "FROM"
+      WHITESPACE@169..170 " "
+      RELATION_FROM_ITEM@170..176
+        RELATION_NAME_REF@170..176
+          PATH_REF@170..176
+            PATH_SEGMENT_REF@170..176
+              IDENT@170..176 "recipe"
+    WHITESPACE@176..177 " "
+    WHERE_CLAUSE@177..201
+      WHERE_KW@177..182 "WHERE"
+      WHITESPACE@182..183 " "
+      BIN_EXPR@183..201
+        NAME_REF@183..186
+          IDENT@183..186 "tag"
+        WHITESPACE@186..187 " "
+        IN_KW@187..189 "IN"
+        WHITESPACE@189..190 " "
+        LITERAL@190..201
+          STRING@190..201 "'breakfast'"
+    SEMICOLON@201..202 ";"
+  WHITESPACE@202..203 "\n"
+  SELECT@203..244
+    SELECT_CLAUSE@203..211
+      SELECT_KW@203..209 "SELECT"
+      WHITESPACE@209..210 " "
+      TARGET_LIST@210..211
+        TARGET@210..211
+          STAR@210..211 "*"
+    WHITESPACE@211..212 " "
+    FROM_CLAUSE@212..223
+      FROM_KW@212..216 "FROM"
+      WHITESPACE@216..217 " "
+      RELATION_FROM_ITEM@217..223
+        RELATION_NAME_REF@217..223
+          PATH_REF@217..223
+            PATH_SEGMENT_REF@217..223
+              IDENT@217..223 "recipe"
+    WHITESPACE@223..224 " "
+    WHERE_CLAUSE@224..243
+      WHERE_KW@224..229 "WHERE"
+      WHITESPACE@229..230 " "
+      BIN_EXPR@230..243
+        NAME_REF@230..233
+          IDENT@230..233 "tag"
+        WHITESPACE@233..234 " "
+        NOT_IN@234..240
+          NOT_KW@234..237 "NOT"
+          WHITESPACE@237..238 " "
+          IN_KW@238..240 "IN"
+        WHITESPACE@240..241 " "
+        LITERAL@241..243
+          POSITIONAL_PARAM@241..243 "$1"
+    SEMICOLON@243..244 ";"
+  WHITESPACE@244..245 "\n"
+  SELECT@245..287
+    SELECT_CLAUSE@245..253
+      SELECT_KW@245..251 "SELECT"
+      WHITESPACE@251..252 " "
+      TARGET_LIST@252..253
+        TARGET@252..253
+          STAR@252..253 "*"
+    WHITESPACE@253..254 " "
+    FROM_CLAUSE@254..265
+      FROM_KW@254..258 "FROM"
+      WHITESPACE@258..259 " "
+      RELATION_FROM_ITEM@259..265
+        RELATION_NAME_REF@259..265
+          PATH_REF@259..265
+            PATH_SEGMENT_REF@259..265
+              IDENT@259..265 "recipe"
+    WHITESPACE@265..266 " "
+    WHERE_CLAUSE@266..286
+      WHERE_KW@266..271 "WHERE"
+      WHITESPACE@271..272 " "
+      BIN_EXPR@272..286
+        NAME_REF@272..275
+          IDENT@272..275 "tag"
+        WHITESPACE@275..276 " "
+        IN_KW@276..278 "IN"
+        WHITESPACE@278..279 " "
+        NAME_REF@279..286
+          IDENT@279..286 "choices"
+    SEMICOLON@286..287 ";"
+  WHITESPACE@287..288 "\n"
+  SELECT@288..340
+    SELECT_CLAUSE@288..296
+      SELECT_KW@288..294 "SELECT"
+      WHITESPACE@294..295 " "
+      TARGET_LIST@295..296
+        TARGET@295..296
+          STAR@295..296 "*"
+    WHITESPACE@296..297 " "
+    FROM_CLAUSE@297..308
+      FROM_KW@297..301 "FROM"
+      WHITESPACE@301..302 " "
+      RELATION_FROM_ITEM@302..308
+        RELATION_NAME_REF@302..308
+          PATH_REF@302..308
+            PATH_SEGMENT_REF@302..308
+              IDENT@302..308 "recipe"
+    WHITESPACE@308..309 " "
+    WHERE_CLAUSE@309..339
+      WHERE_KW@309..314 "WHERE"
+      WHITESPACE@314..315 " "
+      BIN_EXPR@315..339
+        NAME_REF@315..318
+          IDENT@315..318 "tag"
+        WHITESPACE@318..319 " "
+        NOT_IN@319..325
+          NOT_KW@319..322 "NOT"
+          WHITESPACE@322..323 " "
+          IN_KW@323..325 "IN"
+        WHITESPACE@325..326 " "
+        CALL_EXPR@326..339
+          NAME_REF@326..337
+            IDENT@326..337 "get_choices"
+          ARG_LIST@337..339
+            L_PAREN@337..338 "("
+            R_PAREN@338..339 ")"
+    SEMICOLON@339..340 ";"
+  WHITESPACE@340..341 "\n"
+  SELECT@341..401
+    SELECT_CLAUSE@341..349
+      SELECT_KW@341..347 "SELECT"
+      WHITESPACE@347..348 " "
+      TARGET_LIST@348..349
+        TARGET@348..349
+          STAR@348..349 "*"
+    WHITESPACE@349..350 " "
+    FROM_CLAUSE@350..361
+      FROM_KW@350..354 "FROM"
+      WHITESPACE@354..355 " "
+      RELATION_FROM_ITEM@355..361
+        RELATION_NAME_REF@355..361
+          PATH_REF@355..361
+            PATH_SEGMENT_REF@355..361
+              IDENT@355..361 "recipe"
+    WHITESPACE@361..362 " "
+    WHERE_CLAUSE@362..400
+      WHERE_KW@362..367 "WHERE"
+      WHITESPACE@367..368 " "
+      BIN_EXPR@368..400
+        NAME_REF@368..371
+          IDENT@368..371 "tag"
+        WHITESPACE@371..372 " "
+        IN_KW@372..374 "IN"
+        WHITESPACE@374..375 " "
+        TUPLE_EXPR@375..400
+          ROW_KW@375..378 "ROW"
+          L_PAREN@378..379 "("
+          LITERAL@379..390
+            STRING@379..390 "'breakfast'"
+          COMMA@390..391 ","
+          WHITESPACE@391..392 " "
+          LITERAL@392..399
+            STRING@392..399 "'snack'"
+          R_PAREN@399..400 ")"
+    SEMICOLON@400..401 ";"
+  WHITESPACE@401..402 "\n"
+
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+1 │ SELECT * FROM recipe WHERE tag IN ARRAY['breakfast', 'snack', 'appetizer'];
+  ╰╴                                  ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+2 │ SELECT * FROM recipe WHERE tag NOT IN ARRAY['breakfast', 'snack', 'appetizer'];
+  ╰╴                                      ━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━━
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+3 │ SELECT * FROM recipe WHERE tag IN 'breakfast';
+  ╰╴                                  ━━━━━━━━━━━
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+4 │ SELECT * FROM recipe WHERE tag NOT IN $1;
+  ╰╴                                      ━━
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+5 │ SELECT * FROM recipe WHERE tag IN choices;
+  ╰╴                                  ━━━━━━━
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+6 │ SELECT * FROM recipe WHERE tag NOT IN get_choices();
+  ╰╴                                      ━━━━━━━━━━━━━
+error[syntax-error]: Expected a parenthesized value list or subquery.
+  ╭▸ 
+7 │ SELECT * FROM recipe WHERE tag IN ROW('breakfast', 'snack');
+  ╰╴                                  ━━━━━━━━━━━━━━━━━━━━━━━━━
diff --git a/crates/squawk_syntax/src/validation.rs b/crates/squawk_syntax/src/validation.rs
index 8a8255a42..5c0ee5ed6 100644
--- a/crates/squawk_syntax/src/validation.rs
+++ b/crates/squawk_syntax/src/validation.rs
@@ -17,6 +17,7 @@ pub(crate) fn validate(root: &SyntaxNode, errors: &mut Vec<SyntaxError>) {
             match node {
                 ast::AlterAggregate(it) => validate_aggregate_params(it.aggregate().and_then(|x| x.param_list()), errors),
                 ast::BeginFuncOptionList(it) => validate_begin_func_option_list(it, errors),
+                ast::BinExpr(it) => validate_bin_expr(it, errors),
                 ast::CreateAggregate(it) => validate_aggregate_params(it.param_list(), errors),
                 ast::CreateTable(it) => validate_create_table(it, errors),
                 ast::CreateViewLike(it) => validate_non_empty_column_list(it.column_list(), errors),
@@ -589,6 +590,25 @@ fn offset_range(start: TextSize, range: Range<usize>) -> TextRange {
     TextRange::new(begin, end)
 }
 
+// see: https://christopher.xyz/2020/08/01/any-all-pg.html
+fn validate_bin_expr(bin_expr: ast::BinExpr, acc: &mut Vec<SyntaxError>) {
+    if !matches!(
+        bin_expr.op(),
+        Some(ast::BinOp::In(_) | ast::BinOp::NotIn(_))
+    ) {
+        return;
+    }
+    let rhs = match bin_expr.rhs() {
+        None | Some(ast::Expr::ParenExpr(_)) => return,
+        Some(ast::Expr::TupleExpr(tuple)) if tuple.row_token().is_none() => return,
+        Some(rhs) => rhs,
+    };
+    acc.push(SyntaxError::new(
+        "Expected a parenthesized value list or subquery.",
+        rhs.syntax().text_range(),
+    ));
+}
+
 fn validate_join_expr(join_expr: ast::JoinExpr, acc: &mut Vec<SyntaxError>) {
     let Some(join) = join_expr.join() else {
         return;
diff --git a/crates/squawk_syntax/test_data/validation/in_array_expr.sql b/crates/squawk_syntax/test_data/validation/in_array_expr.sql
new file mode 100644
index 000000000..bb3ffb836
--- /dev/null
+++ b/crates/squawk_syntax/test_data/validation/in_array_expr.sql
@@ -0,0 +1,7 @@
+SELECT * FROM recipe WHERE tag IN ARRAY['breakfast', 'snack', 'appetizer'];
+SELECT * FROM recipe WHERE tag NOT IN ARRAY['breakfast', 'snack', 'appetizer'];
+SELECT * FROM recipe WHERE tag IN 'breakfast';
+SELECT * FROM recipe WHERE tag NOT IN $1;
+SELECT * FROM recipe WHERE tag IN choices;
+SELECT * FROM recipe WHERE tag NOT IN get_choices();
+SELECT * FROM recipe WHERE tag IN ROW('breakfast', 'snack');
diff --git a/crates/squawk_syntax/test_data/validation/in_array_expr_ok.sql b/crates/squawk_syntax/test_data/validation/in_array_expr_ok.sql
new file mode 100644
index 000000000..4569bc97f
--- /dev/null
+++ b/crates/squawk_syntax/test_data/validation/in_array_expr_ok.sql
@@ -0,0 +1,6 @@
+SELECT * FROM recipe WHERE tag NOT IN ('breakfast', 'snack', 'appetizer');
+SELECT * FROM recipe WHERE tag <> ALL (ARRAY['breakfast', 'snack', 'appetizer']);
+SELECT * FROM recipe WHERE NOT (tag && ARRAY['breakfast', 'snack', 'appetizer']);
+SELECT ARRAY[1] IN (ARRAY[1]);
+SELECT tag IN ('breakfast') FROM recipe;
+SELECT tag IN (SELECT tag FROM recipe) FROM recipe;