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Fix subtly-wrong volatility checking in BeginCopyFrom().

contain_volatile_functions() is best applied to the output ofexpression_planner(), not its input, so that insertion of functiondefault arguments and constant-folding have been done. (See commentsat CheckMutability, for instance.) It's perhaps unlikely that anyonewill notice a difference in practice, but still we should do it properly.In passing, change variable type from Node* to Expr* to reduce the netnumber of casts needed.Noted while perusing uses of contain_volatile_functions().

1 parent20803d7 commit060b22aCopy full SHA for 060b22a

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src/backend/commands
- copy.c

1 file changed

-5

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`‎src/backend/commands/copy.c‎`

Lines changed: 9 additions & 5 deletions

Original file line number	Diff line number	Diff line change
`@@ -2506,18 +2506,22 @@ BeginCopyFrom(Relation rel,`
`2506`	`2506`	`{`
`2507`	`2507`	`/* attribute is NOT to be copied from input */`
`2508`	`2508`	`/* use default value if one exists */`
`2509`		`-Node*defexpr=build_column_default(cstate->rel,attnum);`
	`2509`	`+Exprdefexpr= (Expr)build_column_default(cstate->rel,`
	`2510`	`+attnum);`
`2510`	`2511`
`2511`	`2512`	`if (defexpr!=NULL)`
`2512`	`2513`	`{`
`2513`		`-/* Initialize expressions in copycontext. */`
`2514`		`-defexprs[num_defaults]=ExecInitExpr(`
`2515`		`-expression_planner((Expr*)defexpr),NULL);`
	`2514`	`+/* Run the expression through planner */`
	`2515`	`+defexpr=expression_planner(defexpr);`
	`2516`	`+`
	`2517`	`+/* Initialize executable expression in copycontext */`
	`2518`	`+defexprs[num_defaults]=ExecInitExpr(defexpr,NULL);`
`2516`	`2519`	`defmap[num_defaults]=attnum-1;`
`2517`	`2520`	`num_defaults++;`
`2518`	`2521`
	`2522`	`+/* Check to see if we have any volatile expressions */`
`2519`	`2523`	`if (!volatile_defexprs)`
`2520`		`-volatile_defexprs=contain_volatile_functions(defexpr);`
	`2524`	`+volatile_defexprs=contain_volatile_functions((Node*)defexpr);`
`2521`	`2525`	`}`
`2522`	`2526`	`}`
`2523`	`2527`	`}`

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Commit060b22a

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`‎src/backend/commands/copy.c‎`

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