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| 1 | +/*- |
| 2 | + * #%L |
| 3 | + * JSQLParser library |
| 4 | + * %% |
| 5 | + * Copyright (C) 2004 - 2026 JSQLParser |
| 6 | + * %% |
| 7 | + * Dual licensed under GNU LGPL 2.1 or Apache License 2.0 |
| 8 | + * #L% |
| 9 | + */ |
| 10 | +package net.sf.jsqlparser.statement.select; |
| 11 | + |
| 12 | +import static org.junit.jupiter.api.Assertions.assertEquals; |
| 13 | +import static org.junit.jupiter.api.Assertions.assertFalse; |
| 14 | +import static org.junit.jupiter.api.Assertions.assertNull; |
| 15 | +import static org.junit.jupiter.api.Assertions.assertSame; |
| 16 | + |
| 17 | +import java.util.ArrayList; |
| 18 | +import java.util.List; |
| 19 | +import net.sf.jsqlparser.JSQLParserException; |
| 20 | +import net.sf.jsqlparser.expression.ExpressionVisitorAdapter; |
| 21 | +import net.sf.jsqlparser.expression.Function; |
| 22 | +import net.sf.jsqlparser.expression.JsonTableFunction; |
| 23 | +import net.sf.jsqlparser.parser.CCJSqlParserUtil; |
| 24 | +import net.sf.jsqlparser.schema.Column; |
| 25 | +import net.sf.jsqlparser.statement.StatementFeatureVisitor; |
| 26 | +import net.sf.jsqlparser.statement.StatementFeatures; |
| 27 | +import org.junit.jupiter.api.Test; |
| 28 | +import org.junit.jupiter.params.ParameterizedTest; |
| 29 | +import org.junit.jupiter.params.provider.ValueSource; |
| 30 | + |
| 31 | +class FromItemVisitorAdapterTest { |
| 32 | + |
| 33 | + @Test |
| 34 | + void visitsEveryRowsFromFunctionWithTheSameContext() throws JSQLParserException { |
| 35 | + PlainSelect select = parse("SELECT * FROM ROWS FROM (f(source_col), g(other_col)) " |
| 36 | + + "WITH ORDINALITY AS rows"); |
| 37 | + RecordingExpressions expressions = new RecordingExpressions(); |
| 38 | + |
| 39 | + select.getFromItem().accept(new FromItemVisitorAdapter<>(expressions), |
| 40 | + expressions.context); |
| 41 | + |
| 42 | + assertEquals(List.of("f", "g"), expressions.functions); |
| 43 | + assertEquals(List.of("source_col", "other_col"), expressions.columns); |
| 44 | + } |
| 45 | + |
| 46 | + @ParameterizedTest |
| 47 | + @ValueSource(strings = { |
| 48 | + "SELECT * FROM f(g(source_col))", |
| 49 | + "SELECT * FROM (SELECT * FROM f(g(source_col))) nested", |
| 50 | + "SELECT * FROM base JOIN f(g(source_col)) AS derived ON 1 = 1" |
| 51 | + }) |
| 52 | + void selectAdapterUsesTheSuppliedExpressionVisitorForTableFunctions(String sql) |
| 53 | + throws JSQLParserException { |
| 54 | + RecordingExpressions expressions = new RecordingExpressions(); |
| 55 | + SelectVisitorAdapter<Void> visitor = new SelectVisitorAdapter<>(expressions); |
| 56 | + |
| 57 | + parse(sql).accept(visitor, expressions.context); |
| 58 | + |
| 59 | + assertEquals(List.of("f", "g"), expressions.functions); |
| 60 | + assertEquals(List.of("source_col"), expressions.columns); |
| 61 | + } |
| 62 | + |
| 63 | + @Test |
| 64 | + void dispatchesJsonTableAndVisitsItsNestedExpressions() throws JSQLParserException { |
| 65 | + PlainSelect select = parse("SELECT * FROM JSON_TABLE(payload, '$' " |
| 66 | + + "PASSING filter_expr AS filter COLUMNS (" |
| 67 | + + "id INT PATH '$.id' DEFAULT fallback_value ON EMPTY, " |
| 68 | + + "NESTED PATH '$.items[*]' COLUMNS (" |
| 69 | + + "value INT PATH '$.value' DEFAULT nested_default ON ERROR))) AS jt"); |
| 70 | + RecordingExpressions expressions = new RecordingExpressions(); |
| 71 | + |
| 72 | + select.getFromItem().accept(new FromItemVisitorAdapter<>(expressions), |
| 73 | + expressions.context); |
| 74 | + |
| 75 | + assertEquals(1, expressions.jsonTables.size()); |
| 76 | + assertSame(((TableFunction) select.getFromItem()).getFunction(), |
| 77 | + expressions.jsonTables.get(0)); |
| 78 | + assertEquals(List.of("payload", "filter_expr", "fallback_value", "nested_default"), |
| 79 | + expressions.columns); |
| 80 | + } |
| 81 | + |
| 82 | + @Test |
| 83 | + void traversesSubqueriesInFunctionArgumentsThroughTheConfiguredVisitorChain() |
| 84 | + throws JSQLParserException { |
| 85 | + RecordingExpressions expressions = new RecordingExpressions(); |
| 86 | + SelectVisitorAdapter<Void> visitor = new SelectVisitorAdapter<>(expressions); |
| 87 | + expressions.setSelectVisitor(visitor); |
| 88 | + |
| 89 | + parse("SELECT * FROM f((SELECT selected_col FROM g(argument_col)))") |
| 90 | + .accept(visitor, expressions.context); |
| 91 | + |
| 92 | + assertEquals(List.of("f", "g"), expressions.functions); |
| 93 | + assertEquals(List.of("selected_col", "argument_col"), expressions.columns); |
| 94 | + } |
| 95 | + |
| 96 | + @Test |
| 97 | + void emptyTableFunctionDoesNotInvokeTheExpressionVisitor() { |
| 98 | + RecordingExpressions expressions = new RecordingExpressions(); |
| 99 | + TableFunction tableFunction = new TableFunction((Function) null); |
| 100 | + |
| 101 | + assertNull(tableFunction.accept(new FromItemVisitorAdapter<>(expressions), |
| 102 | + expressions.context)); |
| 103 | + assertEquals(List.of(), expressions.functions); |
| 104 | + } |
| 105 | + |
| 106 | + @Test |
| 107 | + void featureAnalysisChecksEachTableFunctionOnce() throws JSQLParserException { |
| 108 | + List<String> checkedFunctions = new ArrayList<>(); |
| 109 | + StatementFeatures features = StatementFeatureVisitor.analyse( |
| 110 | + CCJSqlParserUtil.parse("SELECT * FROM ROWS FROM (f(g(1)), h(2))"), name -> { |
| 111 | + checkedFunctions.add(name); |
| 112 | + return true; |
| 113 | + }); |
| 114 | + |
| 115 | + assertEquals(List.of("f", "g", "h"), checkedFunctions); |
| 116 | + assertFalse(features.mayModifyData()); |
| 117 | + } |
| 118 | + |
| 119 | + private static PlainSelect parse(String sql) throws JSQLParserException { |
| 120 | + return ((Select) CCJSqlParserUtil.parse(sql)).getPlainSelect(); |
| 121 | + } |
| 122 | + |
| 123 | + private static final class RecordingExpressions extends ExpressionVisitorAdapter<Void> { |
| 124 | + private final Object context = new Object(); |
| 125 | + private final List<String> columns = new ArrayList<>(); |
| 126 | + private final List<String> functions = new ArrayList<>(); |
| 127 | + private final List<JsonTableFunction> jsonTables = new ArrayList<>(); |
| 128 | + |
| 129 | + @Override |
| 130 | + public <S> Void visit(Column column, S context) { |
| 131 | + assertSame(this.context, context); |
| 132 | + columns.add(column.getColumnName()); |
| 133 | + return super.visit(column, context); |
| 134 | + } |
| 135 | + |
| 136 | + @Override |
| 137 | + public <S> Void visit(Function function, S context) { |
| 138 | + assertSame(this.context, context); |
| 139 | + functions.add(function.getName()); |
| 140 | + return super.visit(function, context); |
| 141 | + } |
| 142 | + |
| 143 | + @Override |
| 144 | + public <S> Void visit(JsonTableFunction function, S context) { |
| 145 | + assertSame(this.context, context); |
| 146 | + jsonTables.add(function); |
| 147 | + return super.visit(function, context); |
| 148 | + } |
| 149 | + } |
| 150 | +} |
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