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feat: Add AST transformation plan and example fixtures
- Create comprehensive AST_PLAN.md outlining sequential transformation strategy (13→14→15→16→17) - Set up __fixtures__/transform/ directory structure with version subdirectories - Add example AST JSON files for each PostgreSQL version (13-17) - Include test queries: SELECT 1, SELECT NULL, SELECT 'hello', SELECT true, SELECT 1+1 - Document key transformation challenges: enum format changes, field renames, new node types - Establish foundation for implementing functional node-level transforms Co-Authored-By: Dan Lynch <[email protected]>
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‎__fixtures__/transform/13/select_boolean.json‎

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{
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"version": 130004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"String": {
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"str": "t"
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}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/13/select_expression.json‎

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{
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"version": 130004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Expr": {
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"kind": 0,
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"name": [
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{
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"String": {
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"str": "+"
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}
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}
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],
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"lexpr": {
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"A_Const": {
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"val": {
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"Integer": {
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"ival": 1
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}
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},
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"location": 7
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}
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},
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"rexpr": {
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"A_Const": {
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"val": {
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"Integer": {
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"ival": 1
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}
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},
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"location": 11
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}
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},
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"location": 9
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/13/select_integer.json‎

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{
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"version": 130004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"Integer": {
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"ival": 1
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}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/13/select_null.json‎

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{
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"version": 130004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"Null": {}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/13/select_string.json‎

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{
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"version": 130004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"String": {
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"str": "hello"
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}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/14/select_boolean.json‎

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{
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"version": 140004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"String": {
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"str": "t"
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}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/14/select_expression.json‎

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{
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"version": 140004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Expr": {
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"kind": 0,
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"name": [
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{
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"String": {
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"str": "+"
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}
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}
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],
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"lexpr": {
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"A_Const": {
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"val": {
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"Integer": {
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"ival": 1
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}
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},
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"location": 7
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}
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},
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"rexpr": {
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"A_Const": {
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"val": {
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"Integer": {
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"ival": 1
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}
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},
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"location": 11
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}
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},
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"location": 9
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/14/select_integer.json‎

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{
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"version": 140004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"Integer": {
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"ival": 1
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}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/14/select_null.json‎

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{
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"version": 140004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"Null": {}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

‎__fixtures__/transform/14/select_string.json‎

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{
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"version": 140004,
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"stmts": [
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{
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"stmt": {
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"SelectStmt": {
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"targetList": [
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{
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"ResTarget": {
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"val": {
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"A_Const": {
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"val": {
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"String": {
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"str": "hello"
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}
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},
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"location": 7
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}
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},
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"location": 7
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}
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}
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],
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"limitOption": 0,
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"op": 0
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}
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}
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}
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]
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}

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