|
| 1 | +// Copyright 2026 GoSQLX Authors |
| 2 | +// |
| 3 | +// Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | + |
| 5 | +package parser_test |
| 6 | + |
| 7 | +import ( |
| 8 | + "testing" |
| 9 | + |
| 10 | + "github.com/ajitpratap0/GoSQLX/pkg/gosqlx" |
| 11 | + "github.com/ajitpratap0/GoSQLX/pkg/sql/ast" |
| 12 | + "github.com/ajitpratap0/GoSQLX/pkg/sql/keywords" |
| 13 | +) |
| 14 | + |
| 15 | +// TestTryCast verifies that TRY_CAST(expr AS type) parses in Snowflake |
| 16 | +// (and is identical in shape to CAST). Regression for #483. |
| 17 | +func TestTryCast(t *testing.T) { |
| 18 | + queries := []string{ |
| 19 | + `SELECT TRY_CAST(value AS INT) FROM events`, |
| 20 | + `SELECT TRY_CAST(price AS DECIMAL(10, 2)) FROM products`, |
| 21 | + `SELECT TRY_CAST(name AS VARCHAR(100)) FROM users`, |
| 22 | + `SELECT TRY_CAST(json_col AS VARIANT) FROM events`, |
| 23 | + } |
| 24 | + for _, q := range queries { |
| 25 | + t.Run(q, func(t *testing.T) { |
| 26 | + if _, err := gosqlx.ParseWithDialect(q, keywords.DialectSnowflake); err != nil { |
| 27 | + t.Fatalf("Snowflake TRY_CAST parse failed: %v", err) |
| 28 | + } |
| 29 | + }) |
| 30 | + } |
| 31 | +} |
| 32 | + |
| 33 | +// TestWindowNullTreatment verifies IGNORE NULLS / RESPECT NULLS on window |
| 34 | +// functions parses for Snowflake. Regression for #483. |
| 35 | +func TestWindowNullTreatment(t *testing.T) { |
| 36 | + queries := map[string]string{ |
| 37 | + "lag_ignore_nulls": `SELECT LAG(price) IGNORE NULLS OVER (ORDER BY ts) FROM ticks`, |
| 38 | + "lead_respect_nulls": `SELECT LEAD(price) RESPECT NULLS OVER (PARTITION BY symbol ORDER BY ts) FROM ticks`, |
| 39 | + "first_value_ignore": `SELECT FIRST_VALUE(price) IGNORE NULLS OVER (PARTITION BY symbol ORDER BY ts) FROM ticks`, |
| 40 | + "last_value_respect": `SELECT LAST_VALUE(price) RESPECT NULLS OVER (PARTITION BY symbol ORDER BY ts) FROM ticks`, |
| 41 | + } |
| 42 | + for name, q := range queries { |
| 43 | + q := q |
| 44 | + t.Run(name, func(t *testing.T) { |
| 45 | + if _, err := gosqlx.ParseWithDialect(q, keywords.DialectSnowflake); err != nil { |
| 46 | + t.Fatalf("parse failed: %v", err) |
| 47 | + } |
| 48 | + }) |
| 49 | + } |
| 50 | +} |
| 51 | + |
| 52 | +// TestTryCastASTShape verifies that a TRY_CAST expression has Try=true and |
| 53 | +// TokenLiteral() returns "TRY_CAST", while a plain CAST returns "CAST". |
| 54 | +func TestTryCastASTShape(t *testing.T) { |
| 55 | + tcs := map[string]struct { |
| 56 | + query string |
| 57 | + wantTry bool |
| 58 | + wantLit string |
| 59 | + }{ |
| 60 | + "try_cast": {`SELECT TRY_CAST(value AS INT) FROM events`, true, "TRY_CAST"}, |
| 61 | + "cast": {`SELECT CAST(value AS INT) FROM events`, false, "CAST"}, |
| 62 | + } |
| 63 | + for name, tc := range tcs { |
| 64 | + tc := tc |
| 65 | + t.Run(name, func(t *testing.T) { |
| 66 | + tree, err := gosqlx.ParseWithDialect(tc.query, keywords.DialectSnowflake) |
| 67 | + if err != nil { |
| 68 | + t.Fatalf("parse failed: %v", err) |
| 69 | + } |
| 70 | + var found bool |
| 71 | + var visit func(n ast.Node) |
| 72 | + visit = func(n ast.Node) { |
| 73 | + if n == nil || found { |
| 74 | + return |
| 75 | + } |
| 76 | + if c, ok := n.(*ast.CastExpression); ok { |
| 77 | + if c.Try != tc.wantTry { |
| 78 | + t.Fatalf("Try: want %v, got %v", tc.wantTry, c.Try) |
| 79 | + } |
| 80 | + if c.TokenLiteral() != tc.wantLit { |
| 81 | + t.Fatalf("TokenLiteral: want %q, got %q", tc.wantLit, c.TokenLiteral()) |
| 82 | + } |
| 83 | + found = true |
| 84 | + return |
| 85 | + } |
| 86 | + for _, ch := range n.Children() { |
| 87 | + visit(ch) |
| 88 | + } |
| 89 | + } |
| 90 | + for _, stmt := range tree.Statements { |
| 91 | + visit(stmt) |
| 92 | + } |
| 93 | + if !found { |
| 94 | + t.Fatal("CastExpression not found in AST") |
| 95 | + } |
| 96 | + }) |
| 97 | + } |
| 98 | +} |
0 commit comments